Year	Percent
1950	26.75969
1955	29.15903
1960	32.50817
1965	33.99072
1970	33.06993
1975	32.22659
1980	31.35284
1985	31.22695
1990	31.41356
1995	30.48666
2000	30.0777
2005	30.58715
2010	31.49445
2015	29.95272
2020	27.20882
2025	24.63747
2030	23.09147
2035	22.87375
2040	24.69535
2045	25.41348
2050	24.27544
2055	23.05581
2060	22.42616
2065	22.52435
2070	23.18325
2075	23.79604
2080	23.73858
2085	23.06809
2090	22.37021
2095	22.08619
2100	22.25499