Monthly Mean Sunspot Numbers Royal Observtory of Belsium SILSO version 2 ---------------------------- year ssn ---------------------------- 1975.042 27.3 1975.123 16.7 1975.204 16.9 1975.288 7.7 1975.371 13.1 1975.455 16.7 1975.538 40.4 1975.623 56.7 1975.707 20.3 1975.790 13.6 1975.874 27.9 1975.958 11.6 1976.042 11.9 1976.124 6.4 1976.206 31.5 1976.290 27.3 1976.373 18.2 1976.456 17.9 1976.540 2.9 1976.624 24.1 1976.708 20.0 1976.791 29.7 1976.874 7.9 1976.958 22.3 1977.042 23.8 1977.123 33.3 1977.204 13.0 1977.288 19.0 1977.371 27.0 1977.455 54.9 1977.538 30.6 1977.623 43.0 1977.707 62.4 1977.790 62.1 1977.874 41.6 1977.958 61.4 1978.042 73.7 1978.123 132.6 1978.204 108.4 1978.288 141.2 1978.371 117.1 1978.455 134.6 1978.538 99.7 1978.623 82.4 1978.707 195.7 1978.790 177.1 1978.874 138.5 1978.958 173.9 1979.042 235.9 1979.123 194.7 1979.204 195.3 1979.288 143.7 1979.371 190.3 1979.455 211.7 1979.538 225.7 1979.623 201.4 1979.707 266.9 1979.790 263.6 1979.874 259.5 1979.958 249.6 1980.042 226.1 1980.124 219.4 1980.206 178.7 1980.290 232.2 1980.373 254.7 1980.456 222.7 1980.540 192.9 1980.624 191.7 1980.708 219.6 1980.791 233.3 1980.874 209.5 1980.958 246.9 1981.042 156.6 1981.123 189.9 1981.204 196.6 1981.288 225.3 1981.371 194.7 1981.455 131.6 1981.538 205.3 1981.623 242.5 1981.707 245.3 1981.790 216.2 1981.874 186.0 1981.958 195.4 1982.042 149.8 1982.123 230.9 1982.204 221.1 1982.288 170.3 1982.371 119.3 1982.455 163.7 1982.538 139.4 1982.623 161.9 1982.707 167.4 1982.790 134.3 1982.874 127.5 1982.958 169.0 1983.042 115.5 1983.123 73.1 1983.204 88.7 1983.288 109.6 1983.371 132.5 1983.455 131.5 1983.538 108.9 1983.623 96.0 1983.707 69.9 1983.790 72.5 1983.874 45.7 1983.958 45.6 1984.042 74.8 1984.124 110.2 1984.206 116.7 1984.290 90.4 1984.373 96.9 1984.456 65.1 1984.540 55.7 1984.624 35.0 1984.708 22.6 1984.791 12.6 1984.874 26.5 1984.958 21.4 1985.042 17.8 1985.123 20.7 1985.204 16.9 1985.288 20.4 1985.371 32.4 1985.455 28.3 1985.538 39.9 1985.623 10.1 1985.707 4.3 1985.790 22.0 1985.874 17.9 1985.958 15.8 1986.042 2.8 1986.123 27.9 1986.204 13.8 1986.288 22.4 1986.371 16.1 1986.455 0.6 1986.538 18.1 1986.623 9.9 1986.707 5.1 1986.790 40.1 1986.874 15.4 1986.958 5.8 1987.042 9.8 1987.123 3.4 1987.204 17.4 1987.288 46.0 1987.371 39.1 1987.455 18.8 1987.538 38.2 1987.623 47.9 1987.707 42.2 1987.790 63.4 1987.874 48.8 1987.958 29.1 1988.042 70.5 1988.124 45.4 1988.206 91.2 1988.290 108.8 1988.373 74.2 1988.456 124.3 1988.540 131.4 1988.624 139.4 1988.708 142.7 1988.791 156.5 1988.874 156.8 1988.958 231.2 1989.042 210.1 1989.123 208.7 1989.204 170.4 1989.288 166.3 1989.371 195.4 1989.455 284.5 1989.538 180.5 1989.623 232.0 1989.707 225.1 1989.790 212.2 1989.874 238.2 1989.958 211.4 1990.042 227.4 1990.123 171.8 1990.204 191.7 1990.288 189.7 1990.371 175.2 1990.455 153.3 1990.538 191.1 1990.623 252.1 1990.707 169.1 1990.790 199.4 1990.874 178.8 1990.958 197.1 1991.042 195.3 1991.123 240.3 1991.204 197.0 1991.288 197.6 1991.371 166.9 1991.455 224.7 1991.538 240.2 1991.623 240.8 1991.707 168.9 1991.790 197.1 1991.874 159.5 1991.958 212.6 1992.042 198.3 1992.124 230.7 1992.206 151.0 1992.290 142.2 1992.373 94.3 1992.456 98.5 1992.540 114.2 1992.624 91.9 1992.708 94.0 1992.791 133.4 1992.874 129.6 1992.958 122.0 1993.042 81.4 1993.123 127.8 1993.204 102.4 1993.288 94.4 1993.371 78.8 1993.455 69.6 1993.538 80.4 1993.623 62.5 1993.707 31.2 1993.790 71.1 1993.874 48.2 1993.958 68.4 1994.042 84.9 1994.123 54.9 1994.204 47.5 1994.288 27.4 1994.371 29.8 1994.455 39.7 1994.538 50.6 1994.623 34.3 1994.707 40.5 1994.790 67.1 1994.874 29.5 1994.958 32.2 1995.042 32.6 1995.123 45.8 1995.204 46.3 1995.288 21.6 1995.371 19.4 1995.455 22.5 1995.538 20.4 1995.623 18.2 1995.707 15.7 1995.790 30.6 1995.874 14.0 1995.958 14.9 1996.042 13.3 1996.124 7.7 1996.206 12.6 1996.290 6.8 1996.373 7.6 1996.456 16.5 1996.540 11.8 1996.624 19.7 1996.708 3.0 1996.791 0.7 1996.874 24.9 1996.958 14.0 1997.042 7.4 1997.123 11.0 1997.204 12.1 1997.288 23.0 1997.371 25.4 1997.455 20.8 1997.538 12.9 1997.623 35.7 1997.707 59.7 1997.790 32.8 1997.874 50.4 1997.958 55.5 1998.042 44.5 1998.123 50.2 1998.204 82.0 1998.288 70.6 1998.371 74.0 1998.455 90.5 1998.538 96.7 1998.623 121.1 1998.707 132.0 1998.790 78.5 1998.874 97.3 1998.958 119.2 1999.042 86.0 1999.123 98.0 1999.204 103.5 1999.288 93.6 1999.371 149.6 1999.455 207.2 1999.538 173.5 1999.623 142.3 1999.707 106.3 1999.790 168.7 1999.874 188.3 1999.958 116.8 2000.042 133.1 2000.124 165.7 2000.206 217.7 2000.290 191.5 2000.373 165.9 2000.456 188.0 2000.540 244.3 2000.624 180.5 2000.708 156.0 2000.791 141.6 2000.874 158.1 2000.958 143.3 2001.042 142.6 2001.123 121.5 2001.204 165.8 2001.288 161.7 2001.371 142.1 2001.455 202.9 2001.538 123.0 2001.623 161.5 2001.707 238.2 2001.790 194.1 2001.874 176.6 2001.958 213.4 2002.042 184.6 2002.123 170.2 2002.204 147.1 2002.288 186.9 2002.371 187.5 2002.455 128.8 2002.538 161.0 2002.623 175.6 2002.707 187.9 2002.790 151.2 2002.874 147.2 2002.958 135.3 2003.042 133.5 2003.123 75.7 2003.204 100.7 2003.288 97.9 2003.371 86.8 2003.455 118.7 2003.538 128.3 2003.623 115.4 2003.707 78.5 2003.790 97.8 2003.874 82.9 2003.958 72.2 2004.042 60.6 2004.124 74.6 2004.206 74.8 2004.290 59.2 2004.373 72.8 2004.456 66.5 2004.540 83.8 2004.624 69.7 2004.708 48.8 2004.791 74.2 2004.874 70.1 2004.958 28.9 2005.042 48.1 2005.123 43.5 2005.204 39.6 2005.288 38.7 2005.371 61.9 2005.455 56.8 2005.538 62.4 2005.623 60.5 2005.707 37.2 2005.790 13.2 2005.874 27.5 2005.958 59.3 2006.042 20.9 2006.123 5.7 2006.204 17.3 2006.288 50.3 2006.371 37.2 2006.455 24.5 2006.538 22.2 2006.623 20.8 2006.707 23.7 2006.790 14.9 2006.874 35.7 2006.958 22.3 2007.042 29.3 2007.123 18.4 2007.204 7.2 2007.288 5.4 2007.371 19.5 2007.455 21.3 2007.538 15.1 2007.623 9.8 2007.707 4.0 2007.790 1.5 2007.874 2.8 2007.958 17.3 2008.042 4.1 2008.124 2.9 2008.206 15.5 2008.290 3.6 2008.373 4.6 2008.456 5.2 2008.540 0.6 2008.624 0.3 2008.708 1.2 2008.791 4.2 2008.874 6.6 2008.958 1.0 2009.042 1.3 2009.123 1.2 2009.204 0.6 2009.288 1.2 2009.371 2.9 2009.455 6.3 2009.538 5.5 2009.623 0.0 2009.707 7.1 2009.790 7.7 2009.874 6.9 2009.958 16.3 2010.042 19.5 2010.123 28.5 2010.204 24.0 2010.288 10.4 2010.371 13.9 2010.455 18.8 2010.538 25.2 2010.623 29.6 2010.707 36.4 2010.790 33.6 2010.874 34.4 2010.958 24.5 2011.042 27.3 2011.123 48.3 2011.204 78.6 2011.288 76.1 2011.371 58.2 2011.455 56.1 2011.538 64.5 2011.623 65.8 2011.707 120.1 2011.790 125.7 2011.874 139.1 2011.958 109.3 2012.042 94.4 2012.124 47.8 2012.206 86.6 2012.290 85.9 2012.373 96.5 2012.456 92.0 2012.540 100.1 2012.624 94.8 2012.708 93.7 2012.791 76.5 2012.874 87.6 2012.958 56.8 2013.042 96.1 2013.123 60.9 2013.204 78.3 2013.288 107.3 2013.371 120.2 2013.455 76.7 2013.538 86.2 2013.623 91.8 2013.707 54.5 2013.790 114.4 2013.874 113.9 2013.958 124.2 2014.042 117.0 2014.123 146.1 2014.204 128.7 2014.288 112.5 2014.371 112.5 2014.455 102.9 2014.538 100.2 2014.623 106.9 2014.707 130.0 2014.790 90.0 2014.874 103.6 2014.958 112.9 2015.042 93.0 2015.123 66.7 2015.204 54.5 2015.286 75.3 2015.371 88.8 2015.453 66.5 2015.538 65.8 2015.623 64.4 2015.707 78.6 2015.790 63.6 2015.874 62.2 2015.958 58.0 2016.042 57.0 2016.124 56.4 2016.206 54.1 2016.290 37.9 2016.373 51.5 2016.455 20.5 2016.540 32.4 2016.624 50.2 2016.706 44.6 2016.791 33.4 2016.873 21.4 2016.958 18.5 2017.042 25.8 2017.122 26.1 2017.204 17.7 2017.286 32.6 2017.371 18.8 ---------------------------