Year	Percent
1950	14.47808
1955	16.67343
1960	16.18912
1965	15.85673
1970	15.95144
1975	16.12171
1980	16.40505
1985	16.45156
1990	16.3087
1995	15.65922
2000	15.0251
2005	13.43829
2010	11.73713
2015	9.78835
2020	9.21255
2025	8.60021
2030	7.83474
2035	6.98886
2040	6.30331
2045	5.85986
2050	5.5296
2055	5.23664
2060	4.95413
2065	4.70441
2070	4.51319
2075	4.38438
2080	4.31264
2085	4.26955
2090	4.2391
2095	4.21536
2100	4.20064