Year	Percent
1950	11.67876
1955	10.60068
1960	9.8122
1965	9.31874
1970	10.01059
1975	10.32598
1980	11.03679
1985	11.60657
1990	13.71883
1995	13.89726
2000	14.49717
2005	15.40226
2010	17.43874
2015	19.15546
2020	21.20618
2025	23.41173
2030	24.97925
2035	26.15624
2040	26.45031
2045	26.82151
2050	27.74668
2055	29.17449
2060	30.1878
2065	30.85726
2070	31.94367
2075	32.87935
2080	33.71378
2085	34.40153
2090	34.97634
2095	35.49902
2100	36.0357