Year	Percent
1990	2.30947
1991	0
1992	2.17391
1993	-15.73604
1994	-12.83651
1995	-4.38787
1996	-4.07529
1997	-5.79642
1998	-4.85544
1999	-2.42844
2000	-3.18752
2001	-3.54972
2002	-3.74703
2003	-3.82909
2004	-6.36384
2005	0.71127
2006	-4.17248
2007	-6.26777
2008	-7.72397
2009	-11.25084
2010	-13.1722
2011	-1.04353
2012	4.46855
2013	-3.14881
2014	-0.76942
2015	0.10671
2016	-0.19063
2017	-0.34896