Year	Percent
1950	28.76094
1955	28.36441
1960	26.83691
1965	24.86908
1970	23.07902
1975	22.96884
1980	24.06734
1985	26.99739
1990	29.68007
1995	32.4554
2000	34.41385
2005	35.26433
2010	36.82686
2015	35.0343
2020	31.96221
2025	28.65524
2030	26.09607
2035	27.11289
2040	28.73265
2045	29.86707
2050	29.13378
2055	26.68987
2060	25.22164
2065	24.89755
2070	25.30977
2075	25.68291
2080	25.45798
2085	24.64757
2090	23.63695
2095	22.95585
2100	22.81763