Year	Percent
1950	27.79792
1955	25.97105
1960	27.62487
1965	26.08302
1970	25.35694
1975	26.01704
1980	25.8806
1985	27.57714
1990	29.80466
1995	29.33969
2000	27.29902
2005	25.16535
2010	23.303
2015	23.18339
2020	23.45189
2025	22.47952
2030	20.94551
2035	20.09099
2040	19.82197
2045	20.11801
2050	20.58624
2055	20.78169
2060	20.63649
2065	20.30639
2070	20.09487
2075	20.14294
2080	20.35991
2085	20.53768
2090	20.50062
2095	20.25365
2100	19.95453