Year	Percent
1986	3.01948
1987	0.9276
1988	-4.20197
1989	1.30763
1990	-2.36655
1991	-0.25471
1992	-1.19867
1993	-1.56537
1994	-3.11018
1995	-3.40657
1996	-5.14997
1997	-3.29289
1998	-5.63727
1999	-4.39401
2000	-4.43397
2001	-1.43958
2002	-2.49261
2003	0.77135
2004	-1.19027
2005	-0.32542
2006	-21.73768
2007	-24.01912
2008	-20.90332
2009	-24.78377
2010	-12.86416
2011	-20.75019
2012	-20.39954
2013	-27.4852
2014	-23.21143
2015	-26.01271
2016	-52.1194
2017	-60.91739