Year	Percent
1950	12.51314
1955	13.01696
1960	13.63917
1965	13.82695
1970	14.01707
1975	14.23646
1980	15.58283
1985	15.87736
1990	14.21843
1995	13.95969
2000	13.78881
2005	13.32106
2010	12.59671
2015	11.98366
2020	12.33964
2025	11.76033
2030	11.07846
2035	10.38253
2040	9.78927
2045	9.31487
2050	8.91287
2055	8.49369
2060	8.03775
2065	7.59482
2070	7.21275
2075	6.89597
2080	6.63291
2085	6.40268
2090	6.17316
2095	5.96547
2100	5.79251