Year	Percent
1950	29.52782
1955	26.28987
1960	25.62171
1965	23.77778
1970	22.85528
1975	21.68745
1980	22.64523
1985	26.53341
1990	28.70771
1995	28.72733
2000	30.88913
2005	32.80998
2010	32.14859
2015	33.36589
2020	34.54609
2025	34.61491
2030	33.38923
2035	31.97702
2040	30.6836
2045	29.70612
2050	29.24277
2055	28.5399
2060	27.54387
2065	26.51246
2070	25.66528
2075	25.03854
2080	24.54441
2085	24.07254
2090	23.59274
2095	23.14171
2100	22.75933