Year	Percent
1950	29.79125
1955	26.46349
1960	25.56966
1965	24.73458
1970	22.72164
1975	22.47583
1980	24.18461
1985	26.34393
1990	27.99707
1995	28.01166
2000	28.03967
2005	27.27734
2010	26.57564
2015	25.70201
2020	25.76518
2025	26.75799
2030	28.96254
2035	29.77182
2040	29.37553
2045	28.52343
2050	27.1126
2055	26.7658
2060	27.21423
2065	27.48589
2070	27.0864
2075	26.02888
2080	24.8703
2085	24.12209
2090	23.86633
2095	23.77508
2100	23.4426