Year	Percent
1992	2.1773
1993	2.09003
1994	2.26171
1995	2.54456
1996	2.43069
1997	2.22982
1998	1.82398
1999	1.5251
2002	0.58797
2003	0.81836
2004	1.17979
2005	1.33463
2006	1.18073
2007	0.9244
2008	0.68181
2009	0.74257
2010	1.01309
2011	1.23961
2012	1.48927
2013	1.87969
2014	2.13876
2015	2.01088
2016	1.75954
2017	1.40662