Year % 1995 16.38 1998 15.43 2000 14.59 2001 16.15 2002 14.72 2003 16.78 2004 16.78 2005 16.29 2007 14.25 2008 14.45 2009 14.75 2010 14.99 2011 15.11 2012 15.18 2013 14.36 2015 14.54 2016 16.93 2019 14.94