Year	Percent
1950	27.50741
1955	28.4139
1960	27.96141
1965	27.98892
1970	28.00299
1975	25.55145
1980	25.88993
1985	25.56748
1990	26.11948
1995	28.28561
2000	30.02964
2005	30.05863
2010	30.3797
2015	29.44294
2020	29.37971
2025	30.17139
2030	31.4902
2035	32.10898
2040	31.7971
2045	31.11615
2050	30.28379
2055	29.70876
2060	29.4304
2065	29.14822
2070	28.67939
2075	28.0502
2080	27.37431
2085	26.7688
2090	26.25453
2095	25.76561
2100	25.25364