Year	Percent
1950	6.26995
1955	6.21367
1960	6.63911
1965	7.41465
1970	6.46883
1975	6.89302
1980	8.01512
1985	7.71942
1990	6.43835
1995	5.6272
2000	5.88709
2005	6.25168
2010	6.0694
2015	5.56555
2020	5.19373
2025	5.65384
2030	5.72496
2035	5.66268
2040	5.517
2045	5.28994
2050	5.17559
2055	5.2316
2060	5.3374
2065	5.36256
2070	5.29457
2075	5.18648
2080	5.10755
2085	5.09198
2090	5.10414
2095	5.09539
2100	5.04585