Year	Percent
1950	6.06317
1955	5.59111
1960	5.50185
1965	5.29087
1970	5.35725
1975	5.60583
1980	5.63186
1985	6.46429
1990	7.47594
1995	8.73804
2000	9.6434
2005	10.04578
2010	10.37054
2015	11.67696
2020	13.37906
2025	15.49044
2030	17.70266
2035	19.52782
2040	21.65834
2045	24.12508
2050	26.47108
2055	27.97414
2060	28.66708
2065	28.99693
2070	29.64048
2075	31.30681
2080	32.77018
2085	33.80348
2090	34.39823
2095	34.76176
2100	35.19291