Year	Percent
1950	7.15328
1955	6.70472
1960	7.53113
1965	8.91016
1970	9.59042
1975	10.00419
1980	9.77723
1985	8.44636
1990	7.47228
1995	7.19828
2000	7.36569
2005	7.61359
2010	7.45869
2015	6.87207
2020	6.5829
2025	6.4404
2030	5.96145
2035	6.05052
2040	6.1297
2045	6.08805
2050	5.9787
2055	5.85482
2060	5.75731
2065	5.71789
2070	5.72749
2075	5.71718
2080	5.66343
2085	5.59436
2090	5.53524
2095	5.50584
2100	5.48953