Year	Percent
1992	2.79712
1993	3.22805
1994	3.00525
1995	2.58822
1996	2.34198
1997	1.90596
1998	1.44329
1999	1.33147
2000	1.17336
2001	0.99609
2002	0.95888
2003	0.88081
2004	0.87887
2005	0.8779
2006	1.06858
2007	1.05545
2008	1.13797
2009	1.68912
2010	2.03713
2011	2.07566
2012	2.10393
2013	2.00514
2014	1.59535
2015	1.24063
2016	1.02768
2017	0.91346