Year	Percent
1950	16.97409
1955	16.41388
1960	16.79322
1965	17.16909
1970	17.42302
1975	17.56845
1980	17.70139
1985	17.89927
1990	18.01348
1995	18.19311
2000	18.14348
2005	18.37854
2010	18.5494
2015	18.27427
2020	17.47008
2025	16.62009
2030	15.84008
2035	15.03808
2040	14.18225
2045	13.26711
2050	12.38326
2055	11.56808
2060	10.81478
2065	10.14933
2070	9.49743
2075	8.89449
2080	8.34835
2085	7.84126
2090	7.39843
2095	7.00891
2100	6.67009