Year	Percent
1994	3.31
1995	3.4
1996	3.59
1997	3.06
1998	2.8
1999	2.8
2000	2.73
2001	2.57
2002	2.55
2003	2.13
2004	1.02
2005	1.38
2006	1.44
2007	2.35
2008	2.31
2009	2.19
2010	2.16
2011	2.02
2012	1.93
2013	1.84
2014	2.02
2015	1.61
2016	1.51
2017	1.46