Year	Percent
1950	28.27679
1955	28.53127
1960	28.55852
1965	28.47605
1970	28.20544
1975	27.53232
1980	27.26987
1985	26.5054
1990	26.34013
1995	26.91824
2000	27.73636
2005	28.31443
2010	28.41461
2015	28.10215
2020	27.92859
2025	28.27086
2030	29.0389
2035	30.01147
2040	30.72389
2045	31.10123
2050	31.30052
2055	31.38046
2060	31.46497
2065	31.47722
2070	31.34766
2075	31.08758
2080	30.7217
2085	30.31446
2090	29.90455
2095	29.48157
2100	29.05152