Year % 1995 24.12 1998 19.17 1999 21.62 2000 21.63 2001 21.65 2002 43.72 2003 19.85 2004 14.07 2005 11.37 2006 13.59 2007 11.1 2008 9.45 2009 9.32 2010 8.21 2011 7.77 2012 7.27 2013 7.37 2014 5.84 2015 5.5 2016 5.34 2017 6.63 2018 6.63 2019 4.85