Year Percent 1995 1.37423 1996 2.04622 1997 1.97244 1998 1.93754 1999 1.91186 2000 1.87011 2001 1.83117 2002 0.50531 2003 0.49722 2004 0.46706 2005 0.45844 2006 0.45008 2007 0.44221 2008 0.50638 2009 0.42961 2010 0.42172 2011 0.40872 2012 0.40116 2013 0.60469 2014 0.59503 2015 0.58609 2016 0.57702 2017 0.43687 2018 0.55944 2019 0.84959 2020 0.88219