Year | Value | 2022 | 32.2 | 2021 | 33.4 | 2020 | 42.8 | 2019 | 28.8 | 2018 | 30.3 | 2017 | 32.6 | 2016 | 31.8 | 2015 | 32.7 | 2014 | 33.4 | 2013 | 34.5 | 2012 | 35.3 | 2011 | 38.1 | 2010 | 40.5 | 2009 | 44.6 | 2008 | 46.4 | 2007 | 50.3 | 2006 | 55.9 | 2005 | 61.5 | 2004 | 59.8 | 2003 | 59.4 | 2002 | 60.2 | 2001 | 63.9 | 2000 | 62.4 | 1999 | 62.1 | 1998 | 62.3 | 1997 | 61.3 |
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