Year	Percent
1996	16.06
1997	15.08
1998	17.58
2000	8.1711
2001	7.0842
2003	10.6008
2004	9.1398
2005	6.7004
2006	6.5535
2007	6.6102
2008	7.8352
2009	8.1448
2010	7.6074
2011	7.451
2012	7.4727
2013	6.8926
2014	7.4877
2015	7.1758
2016	7.9499
2017	6.5697