Year	Percent
1950	27.72303
1955	25.8737
1960	24.40915
1965	23.64391
1970	22.9854
1975	25.63153
1980	27.87946
1985	30.55292
1990	33.09719
1995	32.0807
2000	32.21544
2005	29.03944
2010	28.37363
2015	29.31998
2020	30.88316
2025	32.40057
2030	33.65505
2035	32.17122
2040	30.61328
2045	29.66504
2050	29.39468
2055	28.76668
2060	27.88684
2065	27.043
2070	26.38266
2075	25.92498
2080	25.56874
2085	25.21715
2090	24.83899
2095	24.46611
2100	24.16082