Year	Percent
1950	30.3469
1955	29.31435
1960	28.02105
1965	27.42274
1970	27.11082
1975	27.96757
1980	28.68076
1985	29.47466
1990	30.21207
1995	31.49596
2000	32.81204
2005	34.10544
2010	35.30386
2015	35.36039
2020	35.0181
2025	33.80746
2030	32.61373
2035	32.11403
2040	31.84991
2045	31.5833
2050	31.03314
2055	30.12145
2060	29.28114
2065	28.59558
2070	28.01718
2075	27.46087
2080	26.86203
2085	26.26195
2090	25.7313
2095	25.29117
2100	24.94023