Year % 2001 9.474636288723923 2002 11.531493056903624 2003 12.439449313733988 2004 15.952051572726731 2005 14.732398100254807 2006 10.683681230457195 2007 14.965035551206086 2008 16.727466442774702 2009 20.052060966265802 2010 15.339761662139626 2011 14.047280094432981 2012 12.320044610575517 2013 11.428177844736306 2014 10.115951645560175 2015 10.854552147794417 2016 9.611018737119952 2017 7.077113121297558 2018 9.065142894543685 2019 9.683980878803947 2020 11.020479818547562 2021 12.363717848109086 2022 9.990645735379236 2023 6.995321913214099