Year	Percent
1993	2
1994	3.52
1995	2.96
1996	3.12
1997	4.94
1998	5.23
1999	4.44
2000	3.35
2001	3.81
2002	3.24
2003	3.01
2004	4.24
2005	3.42
2006	3.01
2007	3.21
2008	3.23
2009	4.25
2010	3.81
2011	3.35
2012	3.1
2013	3.75
2014	4.07
2015	2.88
2016	1.77
2017	2.22