Year % 2001 24.3309570784225 2002 19.5542841679761 2003 18.2938834241566 2004 17.5686256421803 2005 14.2494618307523 2006 16.9589653490917 2007 15.7190186868295 2008 16.1792214829569 2009 15.5820156536606 2010 12.7439690840371 2011 11.9892039723696 2012 13.58037264292 2013 12.5916486672233 2014 13.2151854999812 2015 10.4317658870573 2016 9.38293980613527 2017 11.2974250111313 2018 11.5503214868155 2019 12.2781747717763 2020 10.2938120344495 2021 13.0395163956566 2022 12.9597502525605