Year	Percent
1950	11.16315
1955	10.96653
1960	11.54607
1965	13.31962
1970	15.17216
1975	17.19391
1980	16.93162
1985	17.80949
1990	22.68405
1995	22.31063
2000	24.74867
2005	24.46144
2010	25.01042
2015	26.7746
2020	28.54305
2025	30.3415
2030	31.2798
2035	32.66947
2040	34.47752
2045	36.57289
2050	38.57088
2055	38.78665
2060	37.70469
2065	36.23603
2070	35.91554
2075	35.87426
2080	35.87028
2085	35.83211
2090	35.73018
2095	35.6675
2100	35.81695