Year	Percent
1996	7.1334
1997	6.3806
1998	7.3162
1999	7.1973
2000	6.7926
2001	5.4013
2002	5.6256
2003	6.0231
2004	5.6762
2005	6.057
2006	4.8904
2007	3.9638
2008	3.9906
2009	5.9015
2010	7.4189
2011	8.1602
2012	8.389
2013	9.4211
2014	8.9181
2015	8.0495
2016	7.4884
2017	5.7679