Year	Percent
1950	27.68069
1955	28.69903
1960	31.82569
1965	31.03791
1970	30.16942
1975	29.5049
1980	29.15149
1985	29.56936
1990	29.11633
1995	27.74092
2000	28.0172
2005	28.10796
2010	28.74217
2015	27.24164
2020	24.76458
2025	22.55983
2030	21.08792
2035	21.01223
2040	22.33827
2045	22.84135
2050	21.73913
2055	20.9414
2060	20.451
2065	20.55184
2070	21.15882
2075	21.71282
2080	21.73044
2085	21.27998
2090	20.78528
2095	20.57157
2100	20.68259