Year	Percent
1950	12.01828
1955	14.63252
1960	16.02065
1965	18.40261
1970	17.64006
1975	17.23759
1980	16.00422
1985	15.49056
1990	14.96256
1995	12.04116
2000	9.64257
2005	8.63462
2010	10.13247
2015	11.79323
2020	10.26125
2025	8.83718
2030	7.83986
2035	7.3616
2040	7.31257
2045	7.41898
2050	7.39611
2055	7.02219
2060	6.49186
2065	6.12868
2070	6.00827
2075	6.03415
2080	6.05649
2085	5.95455
2090	5.74213
2095	5.50953
2100	5.37203