Year	Percent
1950	10.29911
1955	9.91935
1960	9.61904
1965	9.67929
1970	11.33746
1975	11.25389
1980	11.41234
1985	10.77977
1990	9.70003
1995	7.65813
2000	13.00208
2005	11.47868
2010	11.0271
2015	9.6659
2020	8.50084
2025	8.69251
2030	8.79406
2035	8.47492
2040	7.79409
2045	7.27414
2050	7.00288
2055	6.83915
2060	6.61151
2065	6.29345
2070	5.99652
2075	5.78576
2080	5.64887
2085	5.54605
2090	5.42104
2095	5.28851
2100	5.17287