Year % 1995 12.471893306228884 1996 12.889414529444082 1997 14.25596153021643 1998 11.65997455616516 1999 16.075727350409554 2000 14.098979029157347 2001 14.065191727108795 2002 15.166532831857047 2003 15.420274485881398 2004 14.24024466576943 2005 13.984745950466259 2006 14.03593422505114 2007 10.52113420767755 2008 8.926581577632922 2009 9.508567183340585 2010 11.126142238213824 2011 12.554051055175131 2012 6.71894225397576 2013 14.967719264089018 2014 12.304044470965566 2015 22.111280332277058 2016 13.215843858457195 2017 5.969514082327455 2018 5.959948979591841 2019 18.77563451776648 2020 18.862481551760496 2021 10.429974153846157