Year	Percent
1950	25.81976
1955	26.93595
1960	27.29878
1965	27.09144
1970	25.33758
1975	23.64099
1980	22.79622
1985	23.66916
1990	25.52806
1995	26.57475
2000	27.62788
2005	27.46147
2010	26.53081
2015	26.29969
2020	25.60461
2025	24.93672
2030	24.62482
2035	25.26289
2040	24.80947
2045	24.28475
2050	23.66172
2055	22.66037
2060	23.29717
2065	23.8493
2070	23.75295
2075	23.46636
2080	23.03159
2085	22.71557
2090	22.66143
2095	22.7518
2100	22.74418