Year	Percent
1950	17.99805
1955	16.19288
1960	17.24425
1965	17.88627
1970	18.22008
1975	18.02699
1980	17.84101
1985	17.49989
1990	17.92808
1995	17.87884
2000	17.56492
2005	16.75269
2010	16.24105
2015	15.63292
2020	15.11896
2025	14.49459
2030	13.76089
2035	13.00505
2040	12.3067
2045	11.6833
2050	11.107
2055	10.54393
2060	9.99273
2065	9.47088
2070	8.99511
2075	8.56451
2080	8.16053
2085	7.77096
2090	7.4148
2095	7.08168
2100	6.79002