Year	Percent
1990	6.5717
1991	-1.60863
1992	1.50082
1993	0.99348
1994	2.05064
1995	2.24264
1996	-1.28634
1997	-3.75511
1998	-4.69649
1999	-5.77258
2000	-6.33279
2001	-3.6155
2002	-3.40802
2003	-2.65471
2004	-2.68353
2005	-1.05556
2006	-2.06342
2007	-3.53282
2008	-5.04048
2009	-0.85701
2010	-1.99807
2011	-1.95638
2012	-0.44028
2013	1.9478
2014	1.44147
2015	3.09443
2016	4.04732
2017	3.99459