Year % 1995 8.72 1996 7.3 1997 6.81 1998 5.6 1999 5.73 2000 5.95 2001 6.28 2002 4.65 2003 6.32 2004 4.38 2005 7.37 2006 4.6 2007 5.5 2008 3.42 2009 2.37 2010 3.6 2011 3.76 2012 2.42 2013 2.15 2014 1.78 2015 1.77 2017 2.2 2018 2.14 2019 2.15 2020 1.95 2021 2.07