Year	Percent
1950	13.03685
1955	12.75245
1960	12.57011
1965	12.76068
1970	12.84929
1975	12.55063
1980	12.08478
1985	11.49391
1990	10.96187
1995	12.06485
2000	13.69031
2005	15.27188
2010	17.24576
2015	18.95158
2020	20.83916
2025	23.25303
2030	25.35821
2035	26.67224
2040	27.12773
2045	26.79291
2050	26.38703
2055	25.98116
2060	25.64667
2065	25.27351
2070	24.61958
2075	23.91895
2080	23.26297
2085	22.75527
2090	22.36782
2095	22.06213
2100	21.77618