Year	Percent
1950	17.36304
1955	16.24941
1960	16.7157
1965	16.2876
1970	15.95892
1975	15.22939
1980	15.40932
1985	15.6447
1990	15.38372
1995	13.07991
2000	11.5789
2005	11.46231
2010	11.48833
2015	12.92922
2020	11.52249
2025	10.29001
2030	9.57823
2035	9.40633
2040	9.29518
2045	8.84716
2050	8.2747
2055	7.7494
2060	7.36511
2065	7.10605
2070	6.85008
2075	6.56437
2080	6.26538
2085	5.99919
2090	5.78311
2095	5.61324
2100	5.4633