Year	Percent
1950	6.3269
1955	5.55591
1960	6.09123
1965	6.84401
1970	7.53265
1975	8.28327
1980	8.19296
1985	9.13401
1990	12.99768
1995	16.4968
2000	18.95074
2005	19.63054
2010	21.75782
2015	25.0569
2020	27.43954
2025	30.14234
2030	31.79916
2035	33.58547
2040	35.16111
2045	36.68274
2050	38.22079
2055	39.57206
2060	40.9683
2065	40.7549
2070	40.58553
2075	40.1954
2080	39.92149
2085	39.89854
2090	39.9191
2095	39.81098
2100	39.65014