Year Number 1996 56.8306007385254 1998 59.0163917541504 2000 31.1475410461426 2002 31.8918914794922 2003 24.8648643493652 2004 13.9303483963013 2005 14.2156858444214 2006 21.9512195587158 2007 18.9320392608643 2008 16.990291595459 2009 21.5311012268066 2010 16.2679424285889 2011 19.9052124023438 2012 23.222749710083 2013 29.3838863372803 2014 28.8461532592773 2015 35.238094329834 2016 35.238094329834 2017 32.8571434020996 2018 38.5714302062988 2019 39.523811340332 2020 43.3333320617676 2021 42.8571434020996 2022 52.3584899902344