Year	Percent
1998	5.09026
1999	4.77584
2000	4.95526
2001	4.79689
2002	3.85738
2003	3.78746
2004	3.34241
2005	3.06495
2006	1.77822
2007	1.33676
2008	1.70104
2009	4.75462
2010	6.76056
2011	5.69636
2012	5.08321
2013	3.84691
2014	3.33376
2015	3.11669
2016	2.98622
2017	2.40477