Year | Value | 2023 | 37.6 | 2022 | 40.2 | 2021 | 44 | 2020 | 48 | 2019 | 40.3 | 2018 | 39.6 | 2017 | 39.6 | 2016 | 40.1 | 2015 | 40 | 2014 | 40.8 | 2013 | 43 | 2012 | 45.4 | 2011 | 47.2 | 2010 | 50 | 2009 | 52.5 | 2008 | 53.7 | 2005 | 59.1 | 2004 | 62.4 | 2003 | 63.3 | 2002 | 62.5 | 2001 | 71.5 | 2000 | 65.4 | 1999 | 69.2 | 1996 | 66.7 | 1992 | 60.3 | 1991 | 57.6 | 1989 | 60.7 | 1988 | 59.4 | 1980 | 65.3 |
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