Year	Percent
1950	16.0724
1955	14.82457
1960	13.60532
1965	12.9978
1970	12.94357
1975	12.67684
1980	12.63263
1985	11.72604
1990	13.13553
1995	14.63591
2000	15.67991
2005	19.09379
2010	19.98065
2015	21.37502
2020	22.32899
2025	22.37251
2030	21.30249
2035	22.64382
2040	24.04697
2045	25.35805
2050	26.86851
2055	26.34984
2060	25.87299
2065	25.88487
2070	26.35087
2075	26.34303
2080	25.98192
2085	25.58829
2090	25.26656
2095	25.01097
2100	24.77407