Year % 2001 11.799238367378706 2002 11.013836460350607 2003 15.174277202772224 2004 16.962756234363 2005 15.153985134343184 2006 13.681958215526555 2007 13.343996413083028 2008 10.090239119821879 2009 6.372948249180592 2010 4.9704519013675155 2011 4.072295766029539 2012 3.1909265811614262 2013 3.2814830584687615 2014 2.2593032121726684 2015 2.775973733726856 2016 3.85585264263997 2017 3.4935243965185228 2018 3.7387604818953277 2019 3.4322455905976628 2020 3.703060731822193 2021 4.020125600728754 2022 3.810963773219452 2023 2.7974659859449402