Year	Percent
1950	11.70552
1955	12.32764
1960	12.61536
1965	13.16831
1970	13.80298
1975	14.32867
1980	15.02973
1985	15.40934
1990	19.13987
1995	18.60458
2000	18.1813
2005	18.5049
2010	20.09993
2015	22.22661
2020	24.50495
2025	26.32189
2030	27.33396
2035	27.87214
2040	28.14846
2045	28.48833
2050	29.00298
2055	29.72439
2060	30.27909
2065	30.85981
2070	31.50857
2075	31.88098
2080	32.33834
2085	32.85377
2090	33.35296
2095	33.81815
2100	34.26212