Year % 2000 14.283 2001 18.838 2002 20.14 2003 20.904 2004 18.746 2005 19.642 2006 21.767 2007 21.954 2008 21.6 2009 21.669 2010 21.295 2011 21.653 2012 22.306 2013 22.183 2014 22.065 2015 21.992 2016 22.368 2017 22.686 2018 23.486 2019 23.648 2020 23.402 2021 24.401 2022 23.364