Year	Percent
1950	29.3669
1955	29.07024
1960	30.49802
1965	28.95716
1970	28.2884
1975	28.38919
1980	28.40359
1985	29.82027
1990	30.58134
1995	29.06485
2000	28.8623
2005	28.36946
2010	26.99255
2015	25.14008
2020	22.45406
2025	20.16044
2030	19.2485
2035	19.63097
2040	20.40538
2045	20.95896
2050	20.53832
2055	19.80923
2060	19.49144
2065	19.79777
2070	20.49162
2075	21.07614
2080	21.16919
2085	20.79609
2090	20.32678
2095	20.09404
2100	20.15712