Year | Value | 2022 | 23.9 | 2021 | 24.9 | 2020 | 27.2 | 2019 | 27.3 | 2018 | 29.3 | 2017 | 31.7 | 2016 | 33.4 | 2015 | 35.8 | 2014 | 38.6 | 2013 | 41.4 | 2012 | 45.7 | 2011 | 48.7 | 2010 | 51.7 | 2009 | 55 | 2008 | 56.9 | 2007 | 59.1 | 2006 | 62.3 | 2005 | 65.1 | 2004 | 67.9 | 2003 | 70.6 | 2002 | 72 | 2001 | 74.5 | 2000 | 76.3 | 1999 | 78.2 | 1998 | 77.8 | 1997 | 77.9 | 1996 | 78.4 | 1995 | 79 | 1994 | 79.8 | 1993 | 80.7 | 1992 | 80.8 | 1991 | 80.5 | 1990 | 80 | 1989 | 79.9 | 1988 | 80.1 | 1987 | 80.1 | 1986 | 79.6 | 1985 | 81.1 | 1984 | 81.4 | 1983 | 81.5 | 1982 | 81 | 1981 | 80.9 |
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