Year	Percent
1950	30.78625
1955	29.14613
1960	25.96152
1965	23.46473
1970	21.44551
1975	20.98739
1980	25.95448
1985	28.54345
1990	30.64876
1995	31.9007
2000	31.25568
2005	30.15576
2010	30.5728
2015	31.87103
2020	32.31457
2025	30.95518
2030	28.65726
2035	25.91215
2040	24.41532
2045	23.89692
2050	23.4234
2055	23.03559
2060	21.32466
2065	19.91084
2070	19.0514
2075	18.71642
2080	18.63751
2085	18.42379
2090	17.95045
2095	17.34336
2100	16.87688