Year	Percent
1996	3.5714
1997	2.1583
1998	2.7701
1999	3.6794
2000	4.2254
2001	4.182
2002	4.0915
2003	4.3478
2004	3.5632
2005	3.537
2006	3.4688
2007	2.7548
2008	2.592
2009	2.27
2010	1.91
2011	1.86
2012	1.28
2013	1.35
2014	0.87
2015	1.5
2016	1.4379
2017	1.4277