Year Number 1996 39.6984939575195 1998 43 2000 40.7960205078125 2002 42.7860679626465 2003 42.7860679626465 2004 42.3076934814453 2005 39.2344512939453 2006 52.1531105041504 2007 35.4067001342773 2008 31.25 2009 35.0710906982422 2010 31.7535552978516 2011 39.4366188049316 2012 45.0704231262207 2013 41.7840385437012 2014 0 2015 5.2380952835083 2016 8.09523773193359 2017 20.9523811340332 2018 20.9523811340332 2019 19.0476188659668 2020 18.5714282989502 2021 21.4285717010498 2022 23.5849056243896