"Year","P20-P40","P60-P80","P80-P90"
1937,9.393639,23.22300,16.00005
1938,8.938489,23.23243,16.48610
1939,9.164042,23.5463,16.35315
1940,9.284597,23.56130,16.19344
1941,9.205768,23.67083,16.2774
1942,8.945687,24.45505,17.14207
1943,9.258795,25.14887,17.04631
1944,9.871875,25.44123,16.84179
1945,9.653027,25.45612,17.15019
1946,9.92963,24.4961,16.23473
1947,10.38635,24.65015,15.76916
1948,10.70346,24.56777,15.64216
1949,10.76139,24.27457,15.68511
1950,10.80672,24.42638,15.59667
1951,10.79621,24.56128,15.8023
1952,11.0657,24.42694,15.71697
1953,11.16754,24.59779,15.87316
1954,11.04425,24.46155,15.72166
1955,10.77191,24.89368,15.99601
1956,10.88470,24.59159,15.91647
1957,10.65025,24.58347,16.08865
1958,10.42501,24.7462,16.19303
1959,10.51574,24.74832,16.24361
1960,10.45115,24.80181,16.24475
1961,10.30306,24.82637,16.32557
1962,10.34143,24.81069,16.46631
1963,10.31358,24.84607,16.52103
1964,10.29847,24.80322,16.48277
1965,10.23216,24.88121,16.57792
1966,9.972907,24.91839,16.5465
1967,10.07411,24.72059,16.48249
1968,10.06331,24.75157,16.48661
1969,9.885257,24.73195,16.58923
1970,9.863015,24.57108,16.61305
1971,9.748585,24.68647,16.73759
1972,9.50804,24.58951,16.82675
1973,9.420586,24.62987,16.90210
1974,9.378757,24.53513,16.85654
1975,9.17872,24.50146,16.80667
1976,9.116645,24.58781,16.99502
1977,9.024789,24.38767,17.09636
1978,9.194735,24.02964,16.99325
1979,9.368245,24.13958,16.97431
1980,9.24913,23.95318,16.92912
1981,9.168872,23.97016,16.97671
1982,8.930606,23.73605,16.95244
1983,8.779403,23.66453,17.0081
1984,8.699072,23.58174,17.02216
1985,8.66341,23.48031,17.00972
1986,8.602717,23.26969,16.86637
1987,8.506842,22.89023,16.56986
1988,8.387847,22.54099,16.36786
1989,8.428836,22.56777,16.39278
1990,8.483455,22.51829,16.33172
1991,8.488305,22.64156,16.48321
1992,8.341016,22.30986,16.29416
1993,8.346816,22.27346,16.34886
1994,8.417307,22.31529,16.44234
1995,8.403296,22.16140,16.34179
1996,8.382732,21.97423,16.23248
1997,8.310766,21.66877,16.00783
1998,8.345338,21.50593,15.89789
1999,8.280885,21.24913,15.75778
2000,8.255976,21.0271,15.61399
2001,8.310182,21.23205,15.81767
2002,8.369065,21.60446,16.09284
2003,8.247996,21.52860,16.13241
2004,8.0631,21.37433,16.11105