Year	Percent
1990	1.42169
1991	1.18316
1992	1.2485
1993	1.23161
1994	1.26485
1995	1.10793
1996	0.91759
1997	1.06785
1998	0.9256
1999	0.88429
2000	0.51408
2001	0.67826
2002	0.9374
2003	0.9299
2004	1.12274
2005	1.16286
2006	0.81714
2007	0.78361
2008	0.80649
2009	1.1508
2010	1.15127
2011	1.00427
2012	0.90393
2013	1.05209
2014	1.07762
2015	1.23546
2016	1.35854
2017	1.55268