Year	Percent
1950	28.18956
1955	27.48564
1960	25.92931
1965	25.57759
1970	23.33204
1975	24.4771
1980	26.14724
1985	28.29077
1990	30.68665
1995	31.52183
2000	32.64539
2005	33.41135
2010	34.10747
2015	33.23518
2020	31.1273
2025	28.23347
2030	26.02643
2035	26.05883
2040	26.75007
2045	27.21205
2050	26.68982
2055	24.83289
2060	23.40219
2065	22.82766
2070	22.95354
2075	23.22052
2080	23.09188
2085	22.49974
2090	21.78589
2095	21.33188
2100	21.25478