Year	Percent
1992	1.62722
1993	1.91347
1994	2.32695
1995	2.51812
1996	2.16779
1997	1.6963
1998	1.37093
1999	0.99563
2002	0.51726
2003	0.98004
2004	1.44926
2005	1.56397
2006	1.23239
2007	0.91182
2008	0.75027
2009	0.81931
2010	1.21508
2011	1.30096
2012	1.57566
2013	2.24161
2014	2.40808
2015	2.26163
2016	1.82272
2017	1.36266