Year	Percent
1992	5.621
1993	7.926
1994	6.848
1995	5.449
1996	5.8254
1997	6.3998
1998	5.5443
1999	3.3048
2000	3.8217
2001	3.5444
2002	3.4239
2003	2.7938
2004	3.0853
2005	4.2035
2006	4.0565
2007	4.7342
2008	5.1561
2009	6.6655
2010	8.5296
2011	10.0314
2012	8.7607
2013	8.5626
2014	6.718
2015	5.9629
2016	4.3357
2017	3.0431