Year	Percent
1950	30.60745
1955	29.78459
1960	30.0665
1965	27.78112
1970	28.0945
1975	29.97762
1980	32.02469
1985	32.62083
1990	30.57409
1995	28.84947
2000	28.431
2005	30.06832
2010	30.95009
2015	30.30782
2020	27.71104
2025	24.16626
2030	22.30803
2035	21.19587
2040	20.93405
2045	20.88647
2050	19.85206
2055	18.84612
2060	18.37259
2065	18.5025
2070	18.95356
2075	19.43149
2080	19.63308
2085	19.53407
2090	19.40441
2095	19.47767
2100	19.72866