Year	Percent
1990	0.88474
1991	1.48566
1992	2.02111
1993	2.19905
1994	1.95732
1995	1.5555
1996	1.52504
1997	1.36107
1998	1.12333
1999	0.93736
2000	0.74642
2001	0.69299
2002	0.81913
2003	0.8259
2004	0.74118
2005	0.64958
2006	0.5418
2007	0.52214
2008	0.54401
2009	0.93069
2010	1.131
2011	1.0338
2012	0.87574
2013	0.8764
2014	0.85939
2015	0.82556
2016	0.90221
2017	0.81108