Year	Percent
1996	11.2
1997	9.21
1998	11.58
2000	5.054
2001	3.7817
2003	4.9992
2004	4.3768
2005	3.8694
2006	3.2738
2007	3.396
2008	3.9174
2009	5.1624
2010	4.0564
2011	3.5718
2012	3.1228
2013	2.8422
2014	3.2989
2015	3.7924
2016	5.0497
2017	4.4202