Year	Percent
1950	29.5395
1955	28.08741
1960	27.09364
1965	26.4937
1970	28.31905
1975	29.92193
1980	31.7401
1985	33.37286
1990	33.05218
1995	31.98903
2000	29.78059
2005	27.1933
2010	25.13348
2015	24.4723
2020	24.41625
2025	24.38261
2030	23.64235
2035	22.70891
2040	22.20639
2045	21.84071
2050	21.931
2055	22.17616
2060	22.17088
2065	21.90139
2070	21.55902
2075	21.32823
2080	21.26758
2085	21.30827
2090	21.2947
2095	21.13997
2100	20.90962