Year	Percent
1950	6.48496
1955	6.14851
1960	5.76849
1965	5.44825
1970	5.57298
1975	5.88608
1980	6.06546
1985	6.1206
1990	7.34983
1995	7.99159
2000	9.08954
2005	10.52756
2010	11.75606
2015	13.94913
2020	16.70826
2025	19.80281
2030	22.1514
2035	24.45523
2040	25.9239
2045	27.9351
2050	29.82404
2055	31.8374
2060	33.11687
2065	33.3377
2070	33.93902
2075	34.61605
2080	35.22182
2085	35.71832
2090	36.09541
2095	36.36956
2100	36.63904