Year	Percent
1950	19.03193
1955	19.40438
1960	19.67304
1965	17.69455
1970	15.13307
1975	14.11164
1980	14.54314
1985	14.73131
1990	13.71756
1995	12.81409
2000	12.11134
2005	10.85594
2010	10.41979
2015	9.87279
2020	9.06418
2025	8.44565
2030	8.05838
2035	7.77191
2040	7.44993
2045	7.11259
2050	6.78548
2055	6.47852
2060	6.21265
2065	5.99414
2070	5.82557
2075	5.67223
2080	5.51282
2085	5.36718
2090	5.23412
2095	5.12957
2100	5.05107