Year	Percent
1950	17.66214
1955	18.38408
1960	17.79764
1965	17.42267
1970	16.8726
1975	15.55788
1980	15.83603
1985	16.08768
1990	15.40544
1995	14.26985
2000	13.20015
2005	11.47277
2010	10.8217
2015	10.10068
2020	9.67221
2025	9.08148
2030	8.41551
2035	7.79376
2040	7.2993
2045	6.89298
2050	6.55486
2055	6.2398
2060	5.93898
2065	5.67244
2070	5.45985
2075	5.28777
2080	5.13527
2085	5.01428
2090	4.92322
2095	4.85187
2100	4.78862