Year	Percent
1993	6.26532
1994	7.29195
1995	9.51335
1996	9.15087
1997	9.09706
1998	7.17502
1999	8.51363
2000	8.25318
2001	7.91785
2002	5.46269
2003	7.48918
2004	7.33537
2005	3.38003
2006	3.44156
2007	3.56443
2008	4.20277
2009	4.59053
2010	5.68367
2011	4.42745
2012	4.68907
2013	4.74238
2014	4.96363
2015	5.0193
2016	5.447