Year Number 1996 60.1063842773438 1998 72.8723373413086 2000 52.9100532531738 2002 48.1481475830078 2003 47.2361793518066 2004 43.6893196105957 2005 47.5728149414063 2006 35.2657012939453 2007 38.6473426818848 2008 37.980770111084 2009 38.3886260986328 2010 44.5497627258301 2011 46.445499420166 2012 40.2843589782715 2013 43.1279602050781 2014 53.8095245361328 2015 54.2857131958008 2016 57.1428565979004 2017 58.5714302062988 2018 53.301887512207 2019 52.8301887512207 2020 54.7169799804688 2021 53.7735862731934 2022 58.0188674926758