Year	Percent
1950	17.54171
1955	18.21429
1960	18.77679
1965	19.77314
1970	21.5019
1975	23.08156
1980	24.87943
1985	26.61324
1990	28.68066
1995	29.07787
2000	28.45607
2005	27.4536
2010	26.05255
2015	26.89362
2020	27.6357
2025	27.70349
2030	26.701
2035	24.22586
2040	22.90585
2045	22.01928
2050	21.69971
2055	21.71789
2060	21.6218
2065	21.60163
2070	21.52458
2075	21.45198
2080	21.45091
2085	21.51185
2090	21.54928
2095	21.49664
2100	21.35376