Year	Percent
1950	16.93464
1955	17.92975
1960	18.07674
1965	18.19981
1970	17.61818
1975	16.62726
1980	16.11659
1985	14.75115
1990	14.0239
1995	13.00324
2000	11.83208
2005	10.93404
2010	10.25242
2015	9.83304
2020	9.11018
2025	8.4042
2030	7.7824
2035	7.27268
2040	6.8681
2045	6.52862
2050	6.20286
2055	5.88914
2060	5.61752
2065	5.40053
2070	5.23206
2075	5.09817
2080	4.98564
2085	4.88397
2090	4.79397
2095	4.7258
2100	4.67546