Year	Percent
1998	15.25654
1999	12.2599
2001	16.75755
2002	14.30869
2003	15.681
2004	14.58432
2005	15.18301
2006	14.15931
2007	13.71944
2008	13.71642
2009	15.77107
2010	15.7745
2011	15.80628
2012	16.04387
2013	16.25086
2014	16.25525