Year	Percent
1950	6.30365
1955	7.84559
1960	7.6881
1965	8.01364
1970	8.17838
1975	7.40377
1980	6.66961
1985	6.06234
1990	5.97634
1995	5.96509
2000	6.00974
2005	5.62392
2010	5.51028
2015	5.78072
2020	5.75768
2025	5.71756
2030	5.5355
2035	5.36023
2040	5.25653
2045	5.28488
2050	5.35885
2055	5.39386
2060	5.37528
2065	5.31055
2070	5.25033
2075	5.22515
2080	5.23218
2085	5.23052
2090	5.20415
2095	5.14383
2100	5.0767