Year % 1995 17.05 1998 14.17 1999 16.68 2000 16.82 2001 16.72 2002 19.89 2003 15.04 2004 10.63 2005 10.01 2006 10.05 2007 8.92 2008 8.85 2009 9 2010 11.76 2011 9.69 2012 9.82 2013 11.1 2014 10.61 2015 10.51 2016 11.47 2017 11.92 2018 12.96 2019 17.88