Year	Percent
1992	2.569
1993	1.826
1994	2.1
1995	1.81
1996	1.172
1997	1.9728
1998	1.5839
1999	1.5296
2000	3.0599
2001	2.1052
2002	3.1613
2005	1.1731
2006	1.5393
2007	2.3532
2008	1.2453
2009	1.1533
2010	2.6055
2011	1.0584
2012	0.9331
2013	1.5714
2014	1.4868
2015	1.5943
2016	1.3249
2017	0.7187