Year	Percent
1950	25.06145
1955	25.5055
1960	29.35927
1965	30.64826
1970	30.30421
1975	30.55228
1980	30.05432
1985	31.79151
1990	33.73923
1995	32.69107
2000	30.0115
2005	27.1762
2010	24.93177
2015	24.88115
2020	25.1448
2025	24.07156
2030	22.35168
2035	21.26349
2040	20.85464
2045	21.14686
2050	21.62382
2055	21.80284
2060	21.60073
2065	21.20682
2070	20.96284
2075	21.01537
2080	21.24802
2085	21.43067
2090	21.38306
2095	21.12133
2100	20.80754