Year	Percent
1950	16.97293
1955	17.34968
1960	17.74872
1965	18.28778
1970	18.75032
1975	19.13465
1980	19.2253
1985	18.87402
1990	18.29707
1995	17.24642
2000	16.59731
2005	16.86093
2010	16.66718
2015	15.76947
2020	14.80899
2025	14.07709
2030	13.54665
2035	13.02683
2040	12.46753
2045	11.88837
2050	11.32205
2055	10.83435
2060	10.38316
2065	9.98237
2070	9.57859
2075	9.18108
2080	8.81335
2085	8.47432
2090	8.13967
2095	7.84753
2100	7.57543