Year % 2001 11.750606757002172 2002 14.891704132222793 2003 14.385784520734859 2004 19.119478793729723 2005 13.117818105992043 2006 22.963175129300105 2007 18.285459275077503 2008 8.396793728420427 2009 13.085469041189448 2010 12.94470966744479 2011 21.261957835669747 2012 21.872291819165387 2013 22.336238619762476 2014 20.613527875060534 2015 16.589292885103372 2016 18.358832702619388 2017 15.948773564146734 2018 16.61037048648688 2019 15.648496568825582 2020 15.901158984740743 2021 14.10244602700722 2022 14.719817434943844 2023 11.414473824330813