Year	Percent
1950	30.18651
1955	27.47228
1960	25.91494
1965	26.20965
1970	28.18901
1975	29.08729
1980	30.02202
1985	29.53522
1990	28.78785
1995	28.38055
2000	27.54635
2005	26.45583
2010	26.3247
2015	26.9587
2020	26.19494
2025	25.31966
2030	24.48091
2035	23.32135
2040	23.98608
2045	24.521
2050	24.34073
2055	23.98118
2060	23.4865
2065	23.12567
2070	23.05176
2075	23.15284
2080	23.15985
2085	22.96177
2090	22.63039
2095	22.29064
2100	22.05848