Year % 1996 31.6315354643966 1997 64.8903401082887 1998 29.7642805175731 1999 45.945240439055205 2000 28.383651531562297 2001 14.185020077315698 2002 11.5767018975622 2003 10.549186821380301 2004 11.3055037233527 2005 13.450030553746501 2006 13.497958932224899 2007 23.5625224957546 2008 23.7719149884875 2009 16.5830973059116 2010 14.142676892076999 2011 16.579162497132998 2012 15.5610295005195 2013 20.5176130380113 2014 16.121716309387697 2015 16.0866132032359 2016 14.4890323331026 2017 11.6353270741198 2018 11.3134 2019 10.8926 2020 12.0012 2021 12.5585 2022 10.922