Year	Percent
1950	14.95435
1955	15.0743
1960	13.10303
1965	12.4606
1970	12.68236
1975	12.27802
1980	14.43331
1985	15.28094
1990	15.01882
1995	15.33063
2000	16.65471
2005	19.74048
2010	21.88942
2015	23.6787
2020	23.75474
2025	23.17437
2030	23.38006
2035	23.84953
2040	25.08183
2045	25.91395
2050	26.40488
2055	26.70302
2060	26.79559
2065	26.85474
2070	26.77938
2075	26.47973
2080	26.13032
2085	25.80886
2090	25.53962
2095	25.31323
2100	25.1041