Year % 1994 22.7 2000 7.81 2001 8.1 2002 7.7 2003 7.53 2004 7.86 2005 14.47 2006 11.2 2007 12.55 2008 13.98 2009 15.57 2010 14.41 2011 12.61 2012 15.09 2013 14.52 2014 14.57 2015 15.1 2016 13.31 2018 20.54 2019 20.88 2020 23.47 2021 23.57