Year	Percent
1999	5.29
2000	5.47
2001	4.74
2002	4.75
2003	1.32
2004	0.54
2005	0.79
2006	1.57
2007	1.27
2008	1.3
2009	1.76
2010	1.87
2011	1.77
2012	1.35
2013	1.29
2014	1.33
2015	2.59
2016	2.18
2017	2.05