Year	Percent
1950	29.72845
1955	30.03958
1960	29.6529
1965	29.66449
1970	28.5946
1975	30.14809
1980	31.78659
1985	33.24021
1990	33.84582
1995	32.65132
2000	31.01957
2005	28.61354
2010	28.42364
2015	29.00461
2020	28.60338
2025	27.72069
2030	26.66396
2035	25.86566
2040	25.39569
2045	25.26795
2050	25.39996
2055	25.35925
2060	25.03924
2065	24.66062
2070	24.34543
2075	24.12344
2080	23.96867
2085	23.80036
2090	23.54204
2095	23.18927
2100	22.81555