Year Number 2004 35.3233833312988 2005 51.470588684082 2006 37.2549018859863 2007 18.9320392608643 2008 16.5048542022705 2009 15.3110046386719 2010 11.4832534790039 2011 13.7440757751465 2012 11.3744077682495 2013 18.0094795227051 2014 25.480770111084 2015 25.238094329834 2016 24.761905670166 2017 23.8095245361328 2018 15.2380952835083 2019 16.6666660308838 2020 16.6666660308838 2021 32.3809509277344 2022 31.6037731170654