Year	Percent
1950	7.49694
1955	10.67192
1960	13.22106
1965	13.57477
1970	13.63902
1975	12.63926
1980	11.76284
1985	10.76588
1990	9.70479
1995	10.1758
2000	10.38377
2005	9.96957
2010	9.30107
2015	8.3648
2020	7.87189
2025	7.59403
2030	7.38693
2035	7.08308
2040	6.69818
2045	6.31367
2050	5.99802
2055	5.78459
2060	5.64166
2065	5.4965
2070	5.3139
2075	5.11863
2080	4.95031
2085	4.84142
2090	4.77843
2095	4.72874
2100	4.67659