Year	Percent
1998	10.03927
2000	8.74879
2002	10.8492
2003	10.90315
2005	15.00246
2006	14.22786
2007	13.83673
2009	17.72078
2010	17.53172
2012	9.07263
2013	10.00105
2014	9.83415
2015	9.74154
2016	9.66427