Year	Percent
1992	6.968
1993	4.72785
1994	4.87668
1995	5.71091
1996	5.65082
1997	7.53141
1998	8.74902
1999	7.14699
2000	7.00088
2001	6.46041
2002	5.16379
2003	4.83274
2004	5.53799
2005	6.65622
2006	6.45864
2007	5.58076
2008	5.12339
2009	5.35495
2010	4.62578
2011	5.00714
2012	5.38
2013	5.46851
2014	5.85443
2015	5.88097
2016	5.29206