Year	Percent
1950	12.00204
1955	11.37605
1960	10.7562
1965	10.39132
1970	10.96028
1975	11.29804
1980	12.00578
1985	12.62464
1990	15.24066
1995	15.32663
2000	15.78679
2005	16.44773
2010	18.36372
2015	20.03586
2020	22.16464
2025	24.49614
2030	26.26693
2035	27.6583
2040	28.08089
2045	28.5604
2050	29.41015
2055	30.58512
2060	31.41076
2065	31.974
2070	32.94552
2075	33.84071
2080	34.67631
2085	35.39606
2090	36.01373
2095	36.57216
2100	37.13155