Year	Percent
1950	11.44134
1955	9.36403
1960	7.8317
1965	7.80286
1970	8.23014
1975	8.56122
1980	8.03604
1985	8.2621
1990	11.52255
1995	13.87532
2000	16.63275
2005	15.85143
2010	16.28196
2015	17.66278
2020	21.03876
2025	24.18968
2030	25.82144
2035	27.03421
2040	28.90975
2045	32.13443
2050	36.11773
2055	38.86124
2060	39.05305
2065	38.85456
2070	39.57433
2075	40.58919
2080	40.99648
2085	40.81655
2090	40.36588
2095	40.06858
2100	40.18747