Year	Percent
1950	47.2666
1955	41.70591
1960	36.29499
1965	35.08219
1970	33.94733
1975	34.37741
1980	35.04749
1985	36.19566
1990	37.14076
1995	34.99289
2000	32.45112
2005	29.51162
2010	28.20928
2015	28.15565
2020	28.96691
2025	29.53784
2030	28.96099
2035	27.76366
2040	26.60714
2045	25.79071
2050	25.44031
2055	25.07309
2060	24.47806
2065	23.65087
2070	22.81162
2075	22.14862
2080	21.70381
2085	21.39051
2090	21.0929
2095	20.73651
2100	20.36387