Year	Percent
1994	-22.94447
1995	-22.47642
1996	-18.90058
1997	-18.40811
1998	-17.80109
1999	-23.60245
2000	-20.82771
2001	-39.71305
2002	-38.01001
2003	-20.20445
2004	-16.48769
2005	-20.97749
2006	-23.62885
2007	-25.18918
2008	-19.04354
2009	-21.63943
2010	-23.90448
2011	-20.38503
2012	-24.79332
2013	-20.43716
2014	-24.64484
2015	-21.21929
2016	-20.51448