Year	Percent
1998	7.01
1999	6.88
2000	1.59
2004	4.48
2006	2.33
2007	2.59
2008	0.85
2009	2.9
2010	4.7
2011	2.26
2012	2.93
2013	3.53
2014	1.77
2015	3.09
2016	1.81
2017	3.26