Year Percent 1994 0.01522 1995 0.02074 1996 -0.01122 1997 0.08375 1998 -0.00955 1999 0.02217 2000 0.0032 2001 0.06051 2002 -0.01179 2003 0.02593 2004 0.00616 2005 0.31924 2006 -0.12343 2007 0.68316 2008 0.4428 2009 0.0981 2010 0.50877 2011 0.11768 2012 0.55751 2013 0.23458 2014 0.41048 2015 0.04174 2016 0.18548 2017 0.20864