Year	Percent
1950	17.21571
1955	17.09605
1960	17.48908
1965	17.97051
1970	18.21902
1975	18.37897
1980	18.09228
1985	17.67113
1990	16.58521
1995	14.67712
2000	13.01412
2005	11.48417
2010	10.63973
2015	9.38083
2020	8.80835
2025	7.89682
2030	6.84336
2035	6.14908
2040	5.81057
2045	5.72496
2050	5.68222
2055	5.51214
2060	5.2344
2065	4.9664
2070	4.81819
2075	4.79826
2080	4.82742
2085	4.81787
2090	4.74445
2095	4.64224
2100	4.5684