Year % 1993 12.44 1997 9.93 2001 22.83 2002 16.86 2003 8.22 2004 19.38 2005 9.7 2006 14.95 2007 9.1 2008 5.61 2009 3.09 2010 2.28 2011 1.67 2012 1.98 2013 1.68 2015 3.56 2016 3.97 2018 0.77 2020 2.25 2021 2.27