Year	Percent
1994	2.711
1995	2.8941
1996	3.4723
1997	3.2845
1998	5.7344
1999	3.4337
2000	5.8644
2001	5.1582
2002	3.8316
2003	3.8569
2004	4.7144
2005	2.9797
2006	2.5097
2007	3.5267
2008	2.7501
2009	2.5011
2010	1.9178
2011	2.4827
2012	2.7215
2013	3.2169
2014	2.8428
2015	3.3943
2016	3.7598
2017	3.7041