Year | Value | 2022 | 21.5 | 2021 | 23.2 | 2020 | 23.2 | 2019 | 20.2 | 2018 | 22.2 | 2017 | 25.5 | 2016 | 28.7 | 2015 | 30.4 | 2014 | 34.8 | 2013 | 40.5 | 2012 | 41.2 | 2011 | 41.6 | 2010 | 43.7 | 2009 | 42.9 | 2008 | 45.9 | 2007 | 44.3 | 2006 | 45 | 2005 | 48.2 | 2004 | 57 | 2003 | 49 | 2002 | 40 | 2001 | 40.5 | 2000 | 41.1 | 1997 | 39.4 | 1996 | 42.3 | 1992 | 52.5 | 1989 | 65.3 | 1986 | 37.6 |
|