Year % 1995 5.55 1996 8.26 1997 5.94 1998 4.53 1999 8.27 2000 2.87 2001 3.12 2002 2.89 2003 2.93 2004 3.76 2005 5.46 2006 4.13 2007 3.59 2008 4.4 2009 2.37 2010 2.1 2011 2.88 2012 2.87 2013 1.74 2014 1.95 2015 1.93 2016 2.17 2017 2.33 2018 1.95 2019 1.86 2020 1.84 2021 1.96