Year	Percent
1950	27.38798
1955	27.91491
1960	27.29685
1965	26.3621
1970	26.29884
1975	27.1166
1980	28.6084
1985	30.80668
1990	32.00979
1995	32.26117
2000	32.29092
2005	31.76991
2010	31.74064
2015	31.74131
2020	31.21495
2025	30.48585
2030	29.52709
2035	28.78545
2040	28.14668
2045	27.41148
2050	26.57321
2055	25.68852
2060	24.85474
2065	24.11589
2070	23.44134
2075	22.84231
2080	22.31362
2085	21.85197
2090	21.46939
2095	21.14934
2100	20.88451