Year	Percent
1950	17.35822
1955	18.06513
1960	18.35003
1965	18.28092
1970	18.25017
1975	18.61541
1980	18.46549
1985	18.49332
1990	18.90606
1995	18.93277
2000	19.04104
2005	19.03262
2010	18.56743
2015	17.86109
2020	17.01051
2025	16.3578
2030	15.70431
2035	14.98178
2040	14.18469
2045	13.39483
2050	12.6415
2055	11.95638
2060	11.32289
2065	10.72511
2070	10.17318
2075	9.6523
2080	9.17723
2085	8.73325
2090	8.32133
2095	7.95898
2100	7.59366