Year	Percent
1950	27.58068
1955	27.84208
1960	27.75974
1965	27.47551
1970	27.32562
1975	26.48566
1980	26.32286
1985	26.75546
1990	27.47217
1995	28.85042
2000	29.54187
2005	30.29908
2010	31.0644
2015	30.98018
2020	30.6812
2025	30.23223
2030	30.37147
2035	30.92998
2040	31.17694
2045	31.20363
2050	30.86407
2055	30.29044
2060	29.91258
2065	29.71048
2070	29.52021
2075	29.19363
2080	28.74168
2085	28.22809
2090	27.7428
2095	27.31537
2100	26.9081