Year	Percent
1950	17.54077
1955	17.34986
1960	16.75674
1965	16.33604
1970	15.99407
1975	15.62523
1980	15.1693
1985	14.56075
1990	13.82552
1995	13.34522
2000	12.98852
2005	12.59429
2010	12.40849
2015	12.15224
2020	12.21879
2025	12.59499
2030	13.18478
2035	14.14204
2040	15.75638
2045	17.6914
2050	19.47726
2055	20.81583
2060	21.42372
2065	21.93653
2070	22.64831
2075	23.46434
2080	24.2663
2085	24.70367
2090	24.84439
2095	24.88553
2100	24.98133