Year | Value | 2022 | 29.2 | 2021 | 29.6 | 2020 | 32.5 | 2019 | 32.3 | 2018 | 34.9 | 2017 | 38.1 | 2016 | 40.3 | 2015 | 43.6 | 2014 | 47.3 | 2013 | 51.2 | 2012 | 56.6 | 2011 | 60.2 | 2010 | 63.5 | 2009 | 67.7 | 2008 | 70.8 | 2007 | 72.9 | 2006 | 76 | 2005 | 78.2 | 2004 | 80.9 | 2003 | 83.1 | 2002 | 85.2 | 2001 | 87.8 | 2000 | 89.5 | 1999 | 90.7 | 1998 | 91.4 | 1997 | 91.6 | 1996 | 92.3 | 1995 | 93.3 | 1994 | 94.2 | 1993 | 95 | 1992 | 95.5 | 1991 | 96 | 1990 | 96.3 | 1989 | 96.5 | 1988 | 96.9 | 1987 | 97.2 | 1986 | 97.4 | 1985 | 97.5 | 1984 | 97.5 | 1983 | 97.5 | 1982 | 97.6 | 1981 | 97.6 |
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