Year	Percent
1950	28.73825
1955	29.21363
1960	29.14328
1965	28.96515
1970	29.11199
1975	29.29311
1980	32.73478
1985	32.44756
1990	32.45272
1995	31.84253
2000	22.62746
2005	23.87378
2010	25.3808
2015	24.28591
2020	27.4117
2025	28.45361
2030	30.17462
2035	31.51913
2040	31.29075
2045	31.78247
2050	31.93238
2055	31.8244
2060	31.62743
2065	31.11468
2070	30.37455
2075	29.60935
2080	28.90032
2085	28.25841
2090	27.61908
2095	26.91733
2100	26.18601