Year % 1994 19.52 2000 10 2001 10.02 2002 9.86 2003 9.77 2004 9.58 2005 16.65 2006 15.67 2007 15.82 2008 16.47 2009 17.07 2010 17.7 2011 16.71 2012 17.49 2013 16.94 2014 17.26 2015 15.77 2016 15.69 2018 16.85 2019 17.54 2020 22.24 2021 22.27