Year Number 1996 29.5698928833008 1998 25.6684494018555 2000 8.51063823699951 2002 7.93650770187378 2003 4.23280429840088 2004 0.985221683979034 2005 0 2006 0.97560977935791 2007 3.88349509239197 2008 3.39805817604065 2009 2.87081336975098 2010 1.90476191043854 2011 4.26540279388428 2012 14.2180099487305 2013 17.0616111755371 2014 29.8076915740967 2015 28.0952377319336 2016 23.8095245361328 2017 24.2857151031494 2018 26.1904754638672 2019 25.238094329834 2020 24.2857151031494 2021 29.0476188659668 2022 30.6603775024414