Year	Percent
1950	6.34936
1955	6.1326
1960	7.21964
1965	8.49588
1970	7.78984
1975	7.70343
1980	7.68583
1985	8.05751
1990	7.42931
1995	6.16999
2000	5.90623
2005	6.35429
2010	6.65692
2015	6.28181
2020	5.90477
2025	5.8935
2030	5.5481
2035	5.63993
2040	5.65777
2045	5.60351
2050	5.51405
2055	5.42421
2060	5.36814
2065	5.35491
2070	5.35551
2075	5.3303
2080	5.27614
2085	5.21381
2090	5.16277
2095	5.1299
2100	5.10108