Year	Percent
1950	20.41755
1955	19.83031
1960	19.14306
1965	18.95509
1970	19.26624
1975	19.03981
1980	18.62218
1985	18.64863
1990	19.51538
1995	21.2039
2000	23.79943
2005	25.89175
2010	25.9776
2015	25.73411
2020	24.93837
2025	24.43738
2030	24.35164
2035	24.98169
2040	24.78143
2045	24.2807
2050	24.2608
2055	23.74327
2060	23.79658
2065	23.84865
2070	23.42352
2075	22.94491
2080	22.61629
2085	22.37809
2090	22.24496
2095	22.13694
2100	21.97139