Year	Percent
1984	-3.57724
1985	-5.7277
1986	-4.08768
1987	-7.93067
1988	-18.27087
1989	-19.86548
1990	-13.18968
1991	-12.27487
1992	-10.07925
1993	-9.70557
1994	-14.83539
1995	-14.11369
1996	-18.35967
1997	-17.37252
1998	-11.35779
1999	-8.30677
2000	-7.51329
2001	-10.15312
2002	-9.74987
2003	-13.57123
2004	-16.25551
2005	-13.86517
2006	-5.65122
2007	-11.984
2008	-15.54102
2009	-16.76469
2010	-13.95229
2011	-11.01238
2012	-22.43167
2013	-21.83294
2014	-17.55064
2015	-17.89387
2016	-8.67303
2017	-7.1456