Year	Percent
1950	16.81465
1955	17.28795
1960	17.61291
1965	17.46683
1970	16.79552
1975	15.8882
1980	14.46221
1985	13.20935
1990	12.39839
1995	11.57542
2000	11.14447
2005	10.45312
2010	9.95536
2015	9.54166
2020	8.83918
2025	8.26781
2030	7.79275
2035	7.36372
2040	6.96663
2045	6.61832
2050	6.29757
2055	6.01173
2060	5.77007
2065	5.57207
2070	5.39276
2075	5.23809
2080	5.10171
2085	4.97985
2090	4.8749
2095	4.78519
2100	4.70775