Year % 2001 9.66416066609264 2002 14.722403461800946 2003 11.880206873002962 2004 8.330040663531292 2005 8.67844746815396 2006 9.648153082233257 2007 12.890536303301433 2008 7.227751996327569 2009 7.498964555622104 2010 8.434261984286366 2011 10.295151876223454 2012 11.76656732794066 2013 12.766343283314638 2014 13.370740969896097 2015 16.191482945256574 2016 29.826407565578496 2017 20.743754863794038 2018 16.96174640196911 2019 19.165118025909667 2020 19.002083148657036 2021 20.220210964969397 2022 21.09615251505473 2023 20.778729409550017