Year	Percent
1990	-24.83348
1991	-23.37709
1992	-26.91174
1993	-29.7245
1994	-23.01099
1995	-17.43297
1996	-12.00634
1997	-9.47141
1998	-12.62217
1999	-10.32468
2000	-6.76104
2001	-4.27712
2002	-2.25958
2003	-4.24842
2004	-6.41453
2005	-5.25373
2006	-7.90456
2007	-12.76529
2008	-12.14044
2009	-8.90416
2010	-10.38357
2011	-15.28232
2012	-11.82646
2013	-13.4182
2014	-10.37416
2015	-3.15323
2016	-3.14643