Year	Percent
1950	30.8864
1955	29.72627
1960	24.14541
1965	21.72748
1970	19.52573
1975	21.91602
1980	23.90433
1985	26.9218
1990	29.04223
1995	30.87511
2000	31.39873
2005	32.77117
2010	31.46657
2015	32.38829
2020	32.67606
2025	31.26556
2030	29.08263
2035	25.87491
2040	23.21471
2045	21.75159
2050	21.22406
2055	20.58109
2060	19.8175
2065	19.1336
2070	18.65667
2075	18.48182
2080	18.57597
2085	18.7729
2090	18.91326
2095	18.96443
2100	18.97592