Year | Value | 2022 | 6.3 | 2021 | 6.7 | 2020 | 7.4 | 2019 | 7.8 | 2018 | 9.5 | 2017 | 11.3 | 2016 | 12.8 | 2015 | 14.7 | 2014 | 17.6 | 2013 | 20.3 | 2012 | 26.7 | 2011 | 29.6 | 2010 | 33.8 | 2009 | 37.6 | 2008 | 40.9 | 2007 | 43.1 | 2006 | 46.9 | 2005 | 49.1 | 2004 | 53.4 | 2003 | 57 | 2002 | 60.7 | 2001 | 65.1 | 2000 | 67.9 | 1999 | 70.5 | 1998 | 72.5 | 1997 | 72.9 | 1996 | 74.1 | 1995 | 76.9 | 1994 | 79.7 | 1993 | 82.4 | 1992 | 84.4 | 1991 | 86.2 | 1990 | 87.2 | 1989 | 87.9 | 1988 | 86.6 | 1987 | 88.9 | 1986 | 90.3 | 1985 | 91.2 | 1984 | 91.9 | 1983 | 92.8 | 1982 | 93.4 | 1981 | 93.7 |
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