Year	Percent
1950	14.26896
1955	15.22639
1960	16.35335
1965	17.39014
1970	17.87244
1975	17.85912
1980	16.33153
1985	16.60758
1990	20.11713
1995	19.70923
2000	20.5181
2005	22.09519
2010	23.26756
2015	24.31516
2020	26.50402
2025	29.52003
2030	32.41335
2035	33.9825
2040	34.88788
2045	36.21288
2050	37.25313
2055	38.00416
2060	37.8393
2065	37.46068
2070	37.16791
2075	37.0934
2080	37.27165
2085	37.51849
2090	37.74636
2095	37.94501
2100	38.18666