Year	Percent
1950	17.47015
1955	19.21324
1960	19.02345
1965	18.93517
1970	18.68509
1975	18.82694
1980	19.40716
1985	19.47955
1990	18.6248
1995	17.90196
2000	17.37734
2005	17.14965
2010	17.4125
2015	17.18128
2020	16.04924
2025	15.03374
2030	14.24902
2035	13.65736
2040	13.12486
2045	12.54106
2050	11.92519
2055	11.30538
2060	10.74157
2065	10.25844
2070	9.82947
2075	9.40513
2080	8.98904
2085	8.58272
2090	8.1749
2095	7.8117
2100	7.47052