Year	Percent
1950	11.23238
1955	16.52083
1960	18.54149
1965	18.84823
1970	17.50929
1975	16.7629
1980	16.21887
1985	17.25012
1990	17.76515
1995	16.00548
2000	14.35599
2005	12.52663
2010	13.14905
2015	13.62844
2020	12.72147
2025	11.47448
2030	10.43599
2035	9.97508
2040	9.83662
2045	9.55925
2050	8.96982
2055	8.29388
2060	7.76927
2065	7.46016
2070	7.229
2075	6.95118
2080	6.58555
2085	6.23571
2090	5.95931
2095	5.77261
2100	5.62704