Year	Percent
1950	27.25049
1955	28.5628
1960	29.32589
1965	26.02483
1970	22.84342
1975	23.45395
1980	25.69174
1985	29.08911
1990	30.68394
1995	30.51594
2000	30.72933
2005	31.80679
2010	34.06948
2015	35.43537
2020	34.77889
2025	32.61409
2030	30.76515
2035	29.58859
2040	29.51149
2045	29.63891
2050	28.55174
2055	27.00281
2060	25.81294
2065	25.2882
2070	25.09935
2075	24.78585
2080	24.19919
2085	23.52218
2090	23.02558
2095	22.77937
2100	22.67098