Year	Percent
1950	29.76828
1955	27.1693
1960	25.63282
1965	25.68119
1970	27.39009
1975	28.18245
1980	28.99713
1985	28.54332
1990	27.74279
1995	27.40989
2000	26.68395
2005	25.7443
2010	25.67707
2015	26.36783
2020	25.66717
2025	24.90148
2030	24.10631
2035	23.00027
2040	23.70776
2045	24.23653
2050	24.06712
2055	23.70513
2060	23.21582
2065	22.85921
2070	22.78141
2075	22.87184
2080	22.86728
2085	22.66595
2090	22.33947
2095	22.00372
2100	21.7652