Year	Percent
1950	27.96977
1955	29.12839
1960	29.66302
1965	29.65541
1970	29.83301
1975	28.25582
1980	27.21494
1985	26.5111
1990	26.52968
1995	27.55634
2000	29.2249
2005	31.93917
2010	34.94625
2015	36.91536
2020	37.12298
2025	35.83217
2030	33.45212
2035	31.21433
2040	29.67519
2045	28.47392
2050	27.01772
2055	25.62821
2060	24.16968
2065	23.00458
2070	22.25275
2075	21.82838
2080	21.54983
2085	21.28423
2090	21.00958
2095	20.7868
2100	20.67413