Year	Percent
1992	1.90509
1993	2.00263
1994	2.29401
1995	2.53147
1996	2.30047
1997	1.96556
1998	1.59958
1999	1.26285
2002	0.55293
2003	0.89849
2004	1.31338
2005	1.44835
2006	1.20636
2007	0.91815
2008	0.71579
2009	0.78067
2010	1.11339
2011	1.27008
2012	1.53219
2013	2.05951
2014	2.2726
2015	2.13553
2016	1.79096
2017	1.38475