Year	Percent
1950	20.11448
1955	20.36382
1960	20.66972
1965	20.79718
1970	20.59156
1975	20.24552
1980	20.33187
1985	20.68405
1990	20.17137
1995	20.20269
2000	20.6375
2005	20.79526
2010	20.70789
2015	20.43577
2020	20.06744
2025	19.68357
2030	19.1727
2035	18.53055
2040	17.79261
2045	16.97747
2050	16.11313
2055	15.23842
2060	14.37375
2065	13.53103
2070	12.70628
2075	11.97135
2080	11.24791
2085	10.60338
2090	10.01011
2095	9.45935
2100	8.95205