Year	Percent
1996	4.43
1997	6.34
1998	5.45
1999	5.71
2000	4.1
2001	4.96
2002	4.2
2003	3.85
2004	3.86
2005	2.18
2006	1.58
2007	1.71
2008	1.34
2009	1.54
2010	1.41
2011	1.11
2012	0.91
2013	0.84
2014	0.81
2015	0.82
2016	0.84
2017	0.72