Year	Percent
1950	12.98182
1955	13.25006
1960	13.17346
1965	12.9991
1970	12.76235
1975	12.45149
1980	12.13392
1985	11.87047
1990	11.55829
1995	11.1087
2000	10.58599
2005	10.12715
2010	10.19219
2015	11.01412
2020	12.10661
2025	13.10258
2030	13.96117
2035	14.6441
2040	15.38436
2045	16.21786
2050	16.93713
2055	17.57905
2060	18.1685
2065	18.7309
2070	19.34053
2075	19.91743
2080	20.39092
2085	20.78852
2090	21.15223
2095	21.51182
2100	21.8447