Year	Percent
1950	32.0968
1955	30.5587
1960	28.04237
1965	25.71435
1970	24.35743
1975	25.70036
1980	27.53138
1985	29.43606
1990	31.32591
1995	31.97399
2000	32.87334
2005	33.24216
2010	32.18796
2015	31.37787
2020	31.25853
2025	31.60752
2030	31.29309
2035	30.32371
2040	29.11712
2045	27.68824
2050	26.93677
2055	26.64242
2060	26.25584
2065	25.6534
2070	24.94097
2075	24.336
2080	23.94761
2085	23.76252
2090	23.63999
2095	23.46028
2100	23.20791