Year	Percent
1950	23.11245
1955	21.68189
1960	19.53771
1965	18.69164
1970	19.00028
1975	21.15731
1980	23.54921
1985	23.87366
1990	23.01628
1995	22.84682
2000	24.11174
2005	26.93815
2010	28.94366
2015	29.72862
2020	28.33245
2025	26.68406
2030	26.78201
2035	27.84693
2040	28.09845
2045	26.96886
2050	25.24237
2055	23.68666
2060	23.70859
2065	25.01988
2070	25.77213
2075	25.30149
2080	24.48786
2085	23.7509
2090	23.61953
2095	24.06979
2100	24.51152