Year	Percent
1950	26.09487
1955	24.5159
1960	23.6755
1965	23.3153
1970	23.99252
1975	26.34026
1980	27.89641
1985	29.01743
1990	29.56279
1995	28.95546
2000	28.88148
2005	30.07188
2010	31.65611
2015	33.40242
2020	34.18781
2025	33.37601
2030	32.22416
2035	31.00793
2040	29.95724
2045	29.45994
2050	28.84163
2055	28.16255
2060	27.31745
2065	26.50427
2070	25.86053
2075	25.37622
2080	24.95183
2085	24.52449
2090	24.06915
2095	23.60634
2100	23.16134