Year	Percent
1990	-9.45332
1991	-3.93394
1992	-8.40742
1993	-4.9711
1994	-2.06436
1995	-5.00085
1996	-7.81437
1997	-6.76084
1998	-7.7554
1999	-4.51645
2000	-5.28156
2001	-7.58245
2002	-5.60041
2003	-7.42665
2004	-8.93999
2005	-10.11058
2006	-11.93222
2007	-13.94383
2008	-12.91373
2009	-6.21649
2010	-6.18979
2011	-5.596
2012	-4.9735
2013	-0.77574
2014	-0.4401
2015	-0.62141
2016	-0.89966
2017	-2.12608