Year % 1995 12.91 1996 9.94 1997 12.48 1998 11.53 1999 11.92 2000 11.08 2001 10.55 2002 9.78 2003 9.75 2004 7.14 2005 9.6 2006 9.71 2007 7.02 2008 6.11 2009 9.98 2010 10.14 2011 10.23 2012 10.28 2013 10.14 2015 5.98 2018 6.05 2020 5.9 2021 5.37