Year Number 1996 57.5268821716309 1998 54.5454559326172 2000 58.5106391906738 2002 71.4285736083984 2003 69.8412704467773 2004 57.1428565979004 2005 51.2195129394531 2006 39.0243911743164 2007 48.0582542419434 2008 36.8932037353516 2009 45.4545440673828 2010 40 2011 43.1279602050781 2012 36.9668235778809 2013 35.0710906982422 2014 29.8076915740967 2015 29.0476188659668 2016 37.1428565979004 2017 38.5714302062988 2018 32.8571434020996 2019 30.9523811340332 2020 32.3809509277344 2021 31.9047622680664 2022 34.4339637756348