Year	Percent
1950	30.74986
1955	29.73062
1960	28.2854
1965	26.83526
1970	25.26891
1975	25.21699
1980	25.81445
1985	26.36009
1990	27.04861
1995	27.34908
2000	27.82212
2005	28.85812
2010	29.92086
2015	30.49286
2020	30.71922
2025	30.66732
2030	30.74692
2035	31.15591
2040	31.45823
2045	31.50423
2050	31.24527
2055	30.78851
2060	30.41334
2065	30.1247
2070	29.84847
2075	29.50335
2080	29.08264
2085	28.61311
2090	28.16217
2095	27.73252
2100	27.29331