Year	Percent
1950	28.28354
1955	28.64997
1960	28.958
1965	28.12849
1970	27.21686
1975	27.55117
1980	29.03442
1985	31.56915
1990	34.1581
1995	35.21495
2000	34.43413
2005	33.71239
2010	31.51717
2015	28.95634
2020	27.91627
2025	27.31522
2030	26.9528
2035	25.8083
2040	24.122
2045	22.83913
2050	21.93695
2055	21.3905
2060	21.31738
2065	21.34733
2070	21.19981
2075	20.93261
2080	20.73366
2085	20.69183
2090	20.79586
2095	20.96027
2100	21.05801