Year	Percent
1950	27.45984
1955	27.72691
1960	26.88682
1965	24.03035
1970	24.25086
1975	25.11371
1980	26.37702
1985	26.48612
1990	26.29621
1995	29.39773
2000	27.00763
2005	29.19023
2010	31.55783
2015	31.53941
2020	31.61805
2025	31.05425
2030	31.25142
2035	32.17148
2040	32.31156
2045	31.77731
2050	30.84343
2055	30.10558
2060	29.62322
2065	29.22615
2070	28.62156
2075	27.74064
2080	26.727
2085	25.77267
2090	24.98131
2095	24.30039
2100	23.64828