Year	Percent
1998	1.4
1999	1.4
2001	1.9
2003	1.8
2004	2.49
2005	3.1
2006	3.13
2007	3.7
2009	3.96
2010	3.32
2011	3.23
2012	2.05
2013	2.87
2014	2.63
2015	2.45