Year	Percent
1950	13.52058
1955	14.43012
1960	15.61841
1965	16.93236
1970	17.86012
1975	18.33496
1980	16.74111
1985	16.69658
1990	20.38044
1995	20.87232
2000	23.31597
2005	24.85131
2010	26.06155
2015	27.34928
2020	29.21637
2025	32.08974
2030	34.69531
2035	35.47946
2040	35.88782
2045	36.66402
2050	37.63554
2055	37.95661
2060	37.91721
2065	37.62689
2070	37.38574
2075	37.38909
2080	37.5766
2085	37.86638
2090	38.15382
2095	38.40472
2100	38.66545