Year % 2000 18.489 2001 18.55 2002 17.301 2003 17.938 2004 15.569 2005 17.068 2006 17.226 2007 17.689 2008 20.436 2009 13.761 2010 14.32 2011 14.665 2012 16.438 2013 18.701 2014 18.136 2015 25.219 2016 26.99 2017 22.351 2018 19.699 2019 23.736 2020 25.216 2021 22.427 2022 25.542