Year	Percent
1950	26.6975
1955	25.48689
1960	25.06667
1965	25.07871
1970	25.52061
1975	27.26449
1980	28.76637
1985	30.11128
1990	30.93947
1995	30.71647
2000	30.54655
2005	30.40741
2010	30.81675
2015	31.38081
2020	31.69367
2025	31.74321
2030	31.54141
2035	30.98306
2040	30.53329
2045	30.26128
2050	29.9387
2055	29.48979
2060	28.95967
2065	28.40971
2070	27.86763
2075	27.32111
2080	26.76347
2085	26.19914
2090	25.6266
2095	25.07454
2100	24.57164