Year	Percent
1992	4.29358
1993	4.44615
1994	4.44864
1995	3.58609
1996	3.5187
1997	3.01769
1998	2.26681
1999	1.55123
2000	1.11041
2001	0.84696
2002	0.98169
2003	1.16567
2004	1.13179
2005	1.05359
2006	1.09132
2007	1.21975
2008	1.54275
2009	3.30865
2010	4.8298
2011	5.35579
2012	5.41478
2013	4.77932
2014	4.04283
2015	3.31824
2016	2.69402
2017	2.00682