Year	Percent
1950	30.53993
1955	29.2273
1960	28.16272
1965	27.41252
1970	27.23093
1975	27.62034
1980	25.27804
1985	26.01417
1990	27.20502
1995	27.6281
2000	27.92828
2005	28.85065
2010	31.25948
2015	33.35093
2020	34.13649
2025	33.85823
2030	33.20873
2035	32.09751
2040	31.27637
2045	30.56147
2050	29.4193
2055	28.19826
2060	26.97739
2065	25.88915
2070	24.94749
2075	24.12384
2080	23.40104
2085	22.79094
2090	22.29741
2095	21.91387
2100	21.62633