Year	Percent
1950	16.34301
1955	16.2802
1960	16.60858
1965	16.86846
1970	16.98211
1975	17.6063
1980	17.97525
1985	17.95552
1990	17.41604
1995	17.00135
2000	17.03083
2005	17.30689
2010	17.26992
2015	16.97065
2020	16.26173
2025	15.60528
2030	15.02926
2035	14.44679
2040	13.81716
2045	13.13542
2050	12.44219
2055	11.78006
2060	11.14122
2065	10.5795
2070	10.06321
2075	9.5555
2080	9.07176
2085	8.6198
2090	8.21675
2095	7.83446
2100	7.48139