Year Number 1996 59.1397857666016 1998 60.427806854248 2000 60.638298034668 2002 75.1322784423828 2003 69.3121719360352 2004 68.4729080200195 2005 59.5121955871582 2006 59.0243911743164 2007 58.2524261474609 2008 61.6504859924316 2009 58.8516731262207 2010 57.1428565979004 2011 52.6066360473633 2012 38.8625602722168 2013 38.8625602722168 2014 36.0576934814453 2015 36.6666679382324 2016 32.8571434020996 2017 31.4285717010498 2018 32.3809509277344 2019 37.6190490722656 2020 40.476188659668 2021 40.476188659668 2022 49.5283012390137