Year	Percent
1950	28.06239
1955	29.85371
1960	32.26905
1965	34.44036
1970	35.84569
1975	34.73317
1980	32.68552
1985	30.77511
1990	28.39871
1995	28.68782
2000	28.81225
2005	28.25869
2010	26.67881
2015	23.70313
2020	22.04319
2025	20.92755
2030	20.48422
2035	20.44824
2040	20.31264
2045	20.20728
2050	20.02698
2055	19.90238
2060	19.98364
2065	20.23966
2070	20.52173
2075	20.68697
2080	20.69077
2085	20.61223
2090	20.52831
2095	20.48342
2100	20.47377