Year	Percent
1950	15.92838
1955	17.65831
1960	17.52786
1965	17.72729
1970	17.69835
1975	17.37021
1980	18.30378
1985	19.35966
1990	19.59142
1995	18.70404
2000	17.66182
2005	16.90842
2010	17.64486
2015	17.76647
2020	17.23286
2025	16.13404
2030	15.05762
2035	14.44553
2040	14.09136
2045	13.61696
2050	12.91896
2055	12.13913
2060	11.45705
2065	10.94561
2070	10.53074
2075	10.08512
2080	9.58594
2085	9.06154
2090	8.61919
2095	8.23047
2100	7.89227