Year Percent 1988 -0.01591 1989 -0.00864 1990 0.02303 1991 0 1992 0.05032 1993 0.01171 1994 0.02084 1995 0.0735 1996 0 1997 0 1998 0 1999 0.01494 2000 0 2005 -0.4574 2006 0.00536 2007 -0.05132 2008 -0.18075 2009 -0.01692 2010 -0.00129 2011 0 2012 0 2013 0 2014 0