Year	Percent
1950	18.34667
1955	16.94293
1960	17.75693
1965	18.46113
1970	18.69614
1975	18.41948
1980	17.87285
1985	17.33852
1990	16.70434
1995	15.90809
2000	15.52276
2005	14.71781
2010	14.31597
2015	14.21307
2020	13.31099
2025	12.45265
2030	11.79141
2035	11.30387
2040	10.87937
2045	10.46799
2050	9.99674
2055	9.48891
2060	9.03378
2065	8.65622
2070	8.31746
2075	7.98207
2080	7.64182
2085	7.31254
2090	6.99845
2095	6.72854
2100	6.50086