Year	Percent
1950	27.26611
1955	28.57499
1960	29.29031
1965	29.59798
1970	29.24649
1975	27.7548
1980	26.99827
1985	26.82612
1990	26.90406
1995	27.42141
2000	27.51801
2005	27.4655
2010	27.88193
2015	28.68819
2020	29.62299
2025	30.37525
2030	30.83688
2035	31.11035
2040	31.31725
2045	31.54621
2050	31.61291
2055	31.51014
2060	31.22576
2065	30.8466
2070	30.44923
2075	30.05372
2080	29.63086
2085	29.16202
2090	28.65653
2095	28.13933
2100	27.62234