Year | Value | 2022 | 27.5 | 2021 | 28.4 | 2019 | 28.8 | 2018 | 33 | 2017 | 36.3 | 2016 | 38.7 | 2015 | 40.2 | 2014 | 42.7 | 2013 | 42.7 | 2012 | 47.1 | 2011 | 50 | 2010 | 49.1 | 2009 | 50.5 | 2008 | 50.9 | 2007 | 47.2 | 2006 | 50.5 | 2005 | 51.8 | 2004 | 51.8 | 2003 | 53.6 | 2002 | 52.4 | 2001 | 52.4 | 2000 | 51 | 1999 | 55.3 | 1998 | 57.9 | 1996 | 59.7 | 1995 | 58.2 | 1991 | 65.9 | 1989 | 58.1 |
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