Year	Percent
1996	6.6488
1997	6.9543
1998	7.4731
1999	7.4733
2000	7.0632
2001	6.0148
2002	6.2699
2003	7.0167
2004	6.4035
2005	7.0333
2006	7.1878
2007	5.8325
2008	4.8218
2009	5.8044
2010	7.0192
2011	8.1728
2012	9.3663
2013	10.9082
2014	10.5478
2015	10.0354
2016	8.5858
2017	7.4746