Year Number 1996 58.6956520080566 1998 54.347827911377 2000 54.8913040161133 2002 53.5135116577148 2003 58.9189186096191 2004 61.6915435791016 2005 55.8823547363281 2006 54.4117660522461 2007 52.4271850585938 2008 53.3980598449707 2009 57.8947372436523 2010 62.2009582519531 2011 55.9241714477539 2012 57.3459701538086 2013 59.7156410217285 2014 53.3653831481934 2015 51.4285697937012 2016 50.9523811340332 2017 50.476188659668 2018 48.5714302062988 2019 44.761905670166 2020 37.1428565979004 2021 32.3809509277344 2022 21.698112487793