Year | Value | 2023 | 18.1 | 2022 | 20.2 | 2021 | 22.4 | 2020 | 23.5 | 2019 | 24.7 | 2018 | 26.4 | 2017 | 29.7 | 2016 | 33.5 | 2015 | 35.8 | 2014 | 40.5 | 2013 | 43.6 | 2012 | 46.1 | 2011 | 47.6 | 2010 | 50.7 | 2009 | 57.5 | 2008 | 59.7 | 2007 | 60.8 | 2006 | 68.1 | 2005 | 63.5 | 2004 | 65.8 | 2003 | 65.5 | 2002 | 67.7 | 2001 | 79.3 | 2000 | 81.6 | 1999 | 81.8 | 1998 | 90.7 | 1996 | 81.2 | 1993 | 87.5 | 1990 | 88.1 | 1987 | 93.3 | 1984 | 92.4 |
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