Year	Percent
1950	28.52862
1955	27.03641
1960	25.45426
1965	28.14843
1970	27.78327
1975	30.62123
1980	30.06679
1985	30.15762
1990	30.17609
1995	29.19864
2000	28.74675
2005	28.31016
2010	28.03547
2015	28.1248
2020	27.59334
2025	26.56867
2030	25.28318
2035	23.19716
2040	21.44721
2045	20.16575
2050	19.21817
2055	18.83435
2060	18.47907
2065	18.10618
2070	17.71987
2075	17.45925
2080	17.40914
2085	17.52911
2090	17.71651
2095	17.86192
2100	17.91972