Year | Value | 2023 | 58.8 | 2022 | 60.4 | 2021 | 60.6 | 2020 | 60.7 | 2019 | 61.9 | 2018 | 62.8 | 2017 | 65.3 | 2016 | 68.3 | 2015 | 72.9 | 2014 | 74.9 | 2013 | 76.2 | 2012 | 78.5 | 2011 | 79.3 | 2010 | 82.5 | 2009 | 87.2 | 2008 | 88.1 | 2007 | 88 | 2006 | 91.4 | 2005 | 90.5 | 2004 | 91.1 | 2003 | 91 | 2002 | 91.9 | 2001 | 96 | 2000 | 96.9 | 1999 | 96.6 | 1998 | 98.5 | 1996 | 95.4 | 1993 | 97.4 | 1990 | 97.6 | 1987 | 98.8 | 1984 | 98.7 |
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