Year	Percent
1950	13.46619
1955	13.79371
1960	14.66076
1965	13.38761
1970	14.23348
1975	14.69261
1980	15.14368
1985	15.40515
1990	14.83821
1995	13.58772
2000	13.50242
2005	9.6205
2010	8.09698
2015	8.72933
2020	8.33774
2025	6.91565
2030	6.14389
2035	5.95871
2040	5.94042
2045	5.82204
2050	5.56615
2055	5.3213
2060	5.20352
2065	5.18158
2070	5.20036
2075	5.19344
2080	5.16193
2085	5.10653
2090	5.0756
2095	5.06529
2100	5.06699