Year Percent 1991 -0.05182 1992 -0.09747 1993 -0.14908 1994 -0.12918 1995 0.26304 1996 0.14101 1997 0.1198 1998 0.28894 1999 0.72224 2000 0.33512 2001 0.12234 2002 0.16416 2003 0.46617 2004 0.16677 2005 0.6032 2006 3.37664 2007 1.26586 2008 0.45506 2009 0.84241 2010 2.68779 2011 1.58311 2012 1.97713 2013 1.91563 2014 1.12803 2015 1.21128 2016 1.31608 2017 4.45829