Year	Percent
1950	11.98304
1955	12.33789
1960	12.29632
1965	12.07808
1970	11.75619
1975	12.42557
1980	13.02927
1985	13.87727
1990	16.95847
1995	17.28399
2000	17.80385
2005	18.63055
2010	19.98354
2015	21.32334
2020	22.86695
2025	24.48037
2030	25.72505
2035	26.9624
2040	27.62649
2045	28.63452
2050	29.58088
2055	30.23391
2060	30.58429
2065	30.92413
2070	31.63102
2075	32.4347
2080	33.32587
2085	34.09785
2090	34.78899
2095	35.46168
2100	36.18131