Year	Percent
1950	29.36535
1955	28.63686
1960	28.55291
1965	28.80794
1970	30.05191
1975	29.99939
1980	30.05264
1985	30.82892
1990	31.14164
1995	31.08019
2000	29.20896
2005	27.76337
2010	26.52818
2015	26.83429
2020	26.05107
2025	24.34818
2030	22.99116
2035	22.26702
2040	22.30255
2045	22.59442
2050	22.75941
2055	22.57242
2060	22.13068
2065	21.77956
2070	21.64513
2075	21.70217
2080	21.79085
2085	21.73065
2090	21.46601
2095	21.09893
2100	20.76399