Year % 2001 3.0667751255326956 2002 1.7555664159628201 2003 3.161279121950565 2004 2.37585579700962 2005 2.4750151576331496 2006 2.1287430395079645 2007 2.5238975922559077 2008 3.8988417022101785 2009 5.454418809450267 2010 6.195555523689729 2011 7.565223008369065 2012 6.110898885233414 2013 4.902893442741092 2014 6.219656449293758 2015 5.0483109180414525 2016 6.878450886170278 2017 8.97004001009979 2018 5.7922726958470925 2019 4.359369690530959 2020 4.059770544860578 2021 4.718375016426671 2022 5.92921996937238 2023 7.840529609875816