Year % 1993 12.44 1997 9.93 2001 22.83 2002 16.86 2003 11.82 2004 19.38 2005 12.24 2006 14.95 2007 9.1 2008 9.46 2009 7.86 2010 6.13 2011 6.81 2012 7.01 2013 8.4 2015 10.39 2016 11.24 2018 4.43 2020 9.44 2021 9.5