Year Number 1996 38.1720428466797 1998 21.9251327514648 2000 25 2002 28.0423278808594 2003 31.7460308074951 2004 28.5714282989502 2005 29.7560977935791 2006 29.7560977935791 2007 26.2135925292969 2008 28.1553401947021 2009 30.1435413360596 2010 27.619047164917 2011 27.488151550293 2012 33.1753540039063 2013 36.0189590454102 2014 35.0961532592773 2015 31.4285717010498 2016 30.9523811340332 2017 30 2018 40 2019 48.0952377319336 2020 56.1904754638672 2021 57.6190490722656 2022 56.1320762634277