Year	Percent
1950	30.0701
1955	28.77792
1960	27.5532
1965	26.10758
1970	24.71406
1975	25.40574
1980	25.64808
1985	26.08014
1990	26.45929
1995	26.3335
2000	26.77552
2005	26.92681
2010	27.01306
2015	26.98442
2020	27.02667
2025	27.59804
2030	28.50202
2035	29.32386
2040	29.95605
2045	30.32736
2050	30.49745
2055	30.68086
2060	30.86021
2065	30.93351
2070	30.85966
2075	30.67187
2080	30.41589
2085	30.13463
2090	29.84708
2095	29.53973
2100	29.20966