Global Mean CH4 Mixing Ratios (ppb) ---------------------------------------------------------------------- Observations ---------------------------------------------------------------------- Year MixR. Year MixR. Year MixR. Year MixR. ---------------------------------------------------------------------- 1850 801. 1900 890. 1950 1161. N 2000 1773.39 1851 802. 1901 894. 1951 1169. O 2001 1771.24 1852 804. 1902 898. 1952 1177. A 2002 1772.69 1853 805. 1903 902. 1953 1188. A 2003 1777.38 1854 807. 1904 907. 1954 1197. 2004 1777.03 1855 808. 1905 911. 1955 1207. G 2005 1774.16 1856 809. 1906 916. 1956 1217. M 2006 1775.00 1857 811. 1907 920. 1957 1228. L 2007 1781.44 1858 812. 1908 925. 1958 1239. 2008 1787.01 1859 814. 1909 930. 1959 1250. 2009 1793.55 1860 815. 1910 935. 1960 1263. D 2010 1798.95 1861 817. 1911 940. 1961 1275. A 2011 1803.11 1862 818. 1912 945. 1962 1288. T 2012 1808.03 1863 820. 1913 950. 1963 1301. A 2013 1813.40 1864 821. 1914 956. 1964 1314. 2014 1822.61 1865 823. 1915 961. 1965 1328. 2015 1834.25 1866 825. 1916 967. 1966 1342. 2016 1843.15 1867 826. 1917 972. 1967 1357. 2017 1849.67 1868 828. 1918 978. 1968 1372. 2018 1857.31 1869 829. 1919 984. 1969 1387. 2019 1866.60 1870 831. 1920 990. 1970 1403. 2020 1879.09 1871 833. 1921 995. 1971 1418. 2021 1895.66 1872 834. 1922 1001. 1972 1435. 1873 836. 1923 1007. 1973 1451. 1874 837. 1924 1013. 1974 1467. 1875 839. 1925 1020. 1975 1483. 1876 841. 1926 1026. 1976 1499. 1877 842. 1927 1032. 1977 1516. 1878 844. 1928 1038. 1978 1533. 1879 845. 1929 1044. 1979 1549. 1880 847. 1930 1049. 1980 1566. 1881 849. 1931 1055. 1981 1586. 1882 851. 1932 1060. 1982 1606. 1883 853. 1933 1066. 1983 1626. 1884 855. 1934 1071. ----1984 1644.69 1885 856. 1935 1076. N 1985 1657.28 1886 859. 1936 1081. O 1986 1670.08 1887 861. 1937 1086. A 1987 1682.71 1888 863. 1938 1091. A 1988 1693.19 1889 865. 1939 1096. 1989 1704.54 1890 867. 1940 1102. 1990 1714.42 1891 869. 1941 1108. G 1991 1724.90 1892 872. 1942 1113. M 1992 1735.51 1893 874. 1943 1118. L 1993 1736.49 1894 876. 1944 1123. 1994 1742.06 1895 878. 1945 1129. D 1995 1748.81 1896 881. 1946 1134. A 1996 1751.46 1897 883. 1947 1141. T 1997 1754.54 1898 885. 1948 1147. A 1998 1765.54 1899 888. 1949 1154. 1999 1772.43 --------------------------------------------------------------------------