Year	Percent
1950	18.22968
1955	20.27218
1960	19.27461
1965	18.37153
1970	17.51701
1975	16.80224
1980	16.37264
1985	15.82988
1990	15.45851
1995	14.63427
2000	14.01387
2005	13.49526
2010	11.86509
2015	11.45156
2020	10.97769
2025	10.44844
2030	9.9329
2035	9.45529
2040	9.00091
2045	8.59034
2050	8.21784
2055	7.85031
2060	7.48777
2065	7.16702
2070	6.88107
2075	6.63264
2080	6.40931
2085	6.20667
2090	6.02298
2095	5.85587
2100	5.7044