Year	Percent
1950	31.59368
1955	30.69205
1960	32.05903
1965	29.74256
1970	27.54809
1975	28.74097
1980	29.87131
1985	31.6203
1990	30.95942
1995	29.64215
2000	29.04711
2005	31.09597
2010	33.40182
2015	34.95214
2020	33.47745
2025	29.82485
2030	24.954
2035	22.67877
2040	22.19988
2045	22.29195
2050	21.50499
2055	20.15408
2060	19.39305
2065	19.38316
2070	19.85499
2075	20.46957
2080	20.80312
2085	20.73789
2090	20.52601
2095	20.48072
2100	20.68002