Year	Percent
1996	2.462
1998	1.8127
2001	4.4345
2002	1.8426
2003	2.7942
2004	1.724
2005	2.4427
2006	2.1802
2007	3.7963
2008	4.8311
2009	3.1617
2010	3.5885
2011	4.04
2012	5.3809
2013	6.3479
2014	6.6397
2015	7.2075
2016	5.1379
2017	5.2617