Year % 1995 0 1996 0 1997 0 1998 0 1999 0 2000 0 2001 0 2002 38.98 2003 38.38 2004 36.48 2005 38.32 2006 37.52 2007 34.64 2008 30.07 2009 29.45 2010 30.38 2011 32.12 2012 32.66 2013 32.35 2014 32.11 2015 0 2016 0 2017 0 2018 0 2019 0 2020 0 2021 0