Year	Percent
1950	8.50968
1955	7.87549
1960	7.52151
1965	9.72941
1970	10.64386
1975	9.17901
1980	8.43666
1985	8.38294
1990	9.32296
1995	8.92624
2000	8.40455
2005	7.85548
2010	7.3171
2015	7.46767
2020	7.50325
2025	7.78085
2030	8.16093
2035	7.62708
2040	7.219
2045	6.98642
2050	6.92796
2055	6.92515
2060	6.87473
2065	6.69057
2070	6.42737
2075	6.16597
2080	5.97726
2085	5.86088
2090	5.75766
2095	5.63669
2100	5.48106