Year	Percent
1950	18.57017
1955	20.14884
1960	20.32564
1965	19.37221
1970	17.82283
1975	16.33461
1980	15.09937
1985	14.4563
1990	13.5945
1995	12.82612
2000	11.71311
2005	11.18895
2010	10.53496
2015	9.84738
2020	9.10083
2025	8.43036
2030	7.83721
2035	7.31107
2040	6.83078
2045	6.40438
2050	6.0336
2055	5.7154
2060	5.45075
2065	5.23246
2070	5.05351
2075	4.89692
2080	4.7686
2085	4.66198
2090	4.57854
2095	4.51541
2100	4.46659