Year	Percent
1950	25.06971
1955	23.05363
1960	18.07013
1965	14.82965
1970	12.86731
1975	11.21464
1980	11.34554
1985	11.32116
1990	11.45853
1995	11.79677
2000	11.95504
2005	12.51025
2010	13.27806
2015	14.67572
2020	15.91726
2025	16.09494
2030	15.90717
2035	15.62883
2040	16.70259
2045	18.7668
2050	21.38743
2055	23.26384
2060	23.88175
2065	24.0235
2070	23.79224
2075	23.9393
2080	24.28076
2085	24.54152
2090	24.56637
2095	24.36971
2100	24.07455