Year	Percent
1966	6.70589
1967	6.47085
1968	6.76637
1969	6.76976
1970	6.64963
1971	6.61773
1972	7.11026
1973	5.70548
1974	4.58177
1975	5.03575
1976	4.87316
1977	4.10206
1978	3.65163
1979	3.36055
1980	2.58787
1981	2.59698
1982	2.3888
1983	2.1317
1984	1.32674
1985	2.43484
1986	2.76304
1987	2.76806
1988	2.71623
1989	2.45033
1990	2.54097
1991	2.4771
1992	2.53568
1993	2.51492
1994	2.22232
1995	2.31283
1996	2.08491
1997	2.16723
1998	2.05806
1999	1.93592
2000	1.35719
2001	1.28638
2002	1.39847
2003	0.94788
2004	0.76148
2005	0.484
2006	0.56688
2007	0.37166
2008	0.36551
2009	0.59515
2010	0.52015
2011	0.45654
2012	1.31812
2013	1.25708
2014	1.44292
2015	1.65829
2016	1.61809
2017	1.72011
2018	1.70198
2019	1.58506
2020	1.777
2021	1.47095
2022	1.07696