Year	Percent
1996	11.17
1998	12.01
1999	16.21
2000	16.5
2001	21.77
2002	19.2
2003	18.09
2004	11.96
2005	16.67
2006	17.01
2007	14.91
2008	16.55
2009	15.96
2010	16.47
2011	14.86
2012	13.89
2013	14.37
2014	13.86
2015	12.25
2016	10.09
2017	10.93