Year Number 1996 0 1998 0 2000 3.19148945808411 2002 2.64550256729126 2003 8.99470901489258 2004 1.97044336795807 2005 5.85365867614746 2006 14.6341466903687 2007 12.62135887146 2008 10.6796112060547 2009 3.34928226470947 2010 3.33333325386047 2011 3.79146909713745 2012 4.7393364906311 2013 9.95260620117188 2014 13.4615383148193 2015 13.3333330154419 2016 11.9047622680664 2017 14.7619047164917 2018 14.7619047164917 2019 12.380952835083 2020 14.2857141494751 2021 14.7619047164917 2022 15.5660381317139