Year % 1995 4.62 1996 7.11 1997 4.85 1998 3.96 1999 7.37 2000 2.34 2001 2.52 2002 2.56 2003 2.54 2004 3.63 2005 5.49 2006 3.86 2007 3.4 2008 3.56 2009 2 2010 1.8 2011 2.36 2012 2.22 2013 1.51 2014 1.85 2015 1.88 2016 2.1 2017 2.07 2018 2.04 2019 1.87 2020 1.86 2021 2.09