Year	Percent
1950	29.01688
1955	26.94557
1960	25.66374
1965	25.74154
1970	27.09983
1975	28.01401
1980	28.77613
1985	29.14144
1990	28.72621
1995	28.72044
2000	27.88329
2005	25.60666
2010	24.43055
2015	24.18445
2020	24.40708
2025	24.99168
2030	25.01998
2035	23.67977
2040	22.89945
2045	22.79702
2050	22.82143
2055	23.2827
2060	23.38822
2065	23.03303
2070	22.50461
2075	22.13106
2080	22.00649
2085	22.04308
2090	22.05342
2095	21.88649
2100	21.56957