Year	Percent
1992	3.98325
1993	4.15326
1994	4.37404
1995	3.91255
1996	3.6596
1997	3.76465
1998	3.43432
1999	3.64017
2000	5.46231
2001	6.34557
2002	6.56655
2003	6.16558
2004	5.98204
2005	5.89608
2006	4.32764
2007	2.80123
2008	1.73218
2009	1.84359
2010	2.10518
2011	2.4244
2012	2.68268
2013	2.81551
2014	2.38068
2015	1.7567
2016	1.27742
2017	0.90096