Year	Percent
1950	28.71554
1955	28.71985
1960	27.12155
1965	26.36059
1970	25.6604
1975	25.45914
1980	25.93253
1985	26.02324
1990	26.06498
1995	25.83255
2000	26.07663
2005	26.61775
2010	27.06068
2015	27.53391
2020	28.08393
2025	28.87903
2030	29.7221
2035	30.4036
2040	30.96019
2045	31.34262
2050	31.60278
2055	31.74941
2060	31.75986
2065	31.62446
2070	31.36367
2075	31.02093
2080	30.62059
2085	30.16435
2090	29.66463
2095	29.1313
2100	28.57948