Year	Percent
1996	3.83
1997	5.27
1998	4.73
1999	5.25
2000	3.43
2001	4.68
2002	4.18
2003	3.53
2004	3.14
2005	2.26
2006	1.58
2007	1.61
2008	1.5
2009	1.68
2010	1.4
2011	1.12
2012	1.07
2013	1.06
2014	1.04
2015	1.04
2016	1.03
2017	1.03