Year	Percent
1950	29.75827
1955	27.85787
1960	27.29707
1965	26.81289
1970	28.94768
1975	31.50943
1980	32.41809
1985	32.90531
1990	30.44262
1995	27.862
2000	26.34397
2005	25.22866
2010	24.61869
2015	25.26535
2020	24.71585
2025	23.83215
2030	23.50604
2035	22.91891
2040	23.09704
2045	23.40921
2050	23.29946
2055	23.1142
2060	22.80725
2065	22.53759
2070	22.38662
2075	22.313
2080	22.21176
2085	22.01675
2090	21.77085
2095	21.53336
2100	21.33095