Year Number 1996 60.6557388305664 1998 50.2732238769531 2000 53.0054626464844 2002 60 2003 61.6216201782227 2004 62.1890563964844 2005 60.294116973877 2006 63.9024391174316 2007 53.8834953308105 2008 57.7669906616211 2009 61.7224884033203 2010 65.5502395629883 2011 63.9810409545898 2012 66.3507080078125 2013 68.7203826904297 2014 72.5961532592773 2015 72.8571395874023 2016 71.9047622680664 2017 70.476188659668 2018 74.2857131958008 2019 73.8095245361328 2020 68.5714263916016 2021 68.0952377319336 2022 62.7358474731445