Year	Percent
1950	6.64798
1955	7.36565
1960	6.5524
1965	6.11756
1970	7.11283
1975	7.84317
1980	7.60758
1985	6.20828
1990	5.24068
1995	5.63681
2000	5.47556
2005	5.60935
2010	4.97093
2015	4.58965
2020	4.40366
2025	4.45497
2030	4.66562
2035	4.68975
2040	4.55148
2045	4.36139
2050	4.2738
2055	4.33875
2060	4.4925
2065	4.62832
2070	4.65866
2075	4.60803
2080	4.54884
2085	4.54799
2090	4.59327
2095	4.64497
2100	4.65559