Year	Percent
1950	29.25364
1955	28.39922
1960	27.17352
1965	26.82527
1970	26.06
1975	26.93636
1980	29.55612
1985	31.42679
1990	33.16648
1995	33.68929
2000	33.00163
2005	32.28855
2010	31.41998
2015	30.96799
2020	30.45703
2025	29.42432
2030	28.23282
2035	27.3294
2040	26.37758
2045	25.52096
2050	24.94128
2055	24.06085
2060	23.31121
2065	22.75529
2070	22.27142
2075	21.84894
2080	21.46997
2085	21.12571
2090	20.82862
2095	20.58536
2100	20.40029