Year % 2001 12.94234295202197 2002 9.585892364070844 2003 8.64741980937818 2004 5.354293563470371 2005 3.400829433474109 2006 2.704360878225286 2007 3.866709771017511 2008 10.076914976674347 2009 17.962042834929935 2010 17.688174971911334 2011 20.679394797262756 2012 21.402991148486567 2013 21.883272156094044 2014 20.392378118776968 2015 23.26210715961069 2016 26.467466615421714 2017 26.9065227167957 2018 24.13260539600708 2019 23.77198003011684 2020 34.71491983545491 2021 39.61842873860636 2022 31.91388478545665 2023 27.217586501662833