Year	Percent
1950	27.28827
1955	28.31051
1960	28.75915
1965	28.57093
1970	28.51953
1975	26.98108
1980	26.33357
1985	27.73811
1990	27.93878
1995	28.88602
2000	30.55977
2005	30.74635
2010	32.88836
2015	34.39834
2020	34.83492
2025	34.94105
2030	33.37165
2035	32.18054
2040	31.15826
2045	30.35428
2050	29.86613
2055	29.20815
2060	28.41518
2065	27.57354
2070	26.82425
2075	26.27059
2080	25.89915
2085	25.60409
2090	25.30083
2095	24.96283
2100	24.63782