Year | Value | 2022 | 72.3 | 2021 | 73.5 | 2020 | 74.3 | 2019 | 72.8 | 2018 | 74.1 | 2017 | 75.8 | 2016 | 77.3 | 2015 | 77.6 | 2014 | 78.3 | 2013 | 78.9 | 2012 | 79.8 | 2011 | 80.7 | 2010 | 82 | 2009 | 83.5 | 2008 | 84.5 | 2007 | 85.2 | 2006 | 85.8 | 2005 | 86.4 | 2004 | 87.1 | 2003 | 87.9 | 2002 | 88.5 | 1996 | 89.7 | 1995 | 90 | 1994 | 90.2 | 1993 | 90.3 | 1992 | 90 | 1991 | 89.9 | 1990 | 89.9 | 1989 | 90 | 1988 | 90.1 | 1987 | 90.2 | 1986 | 90.1 | 1985 | 90.1 | 1984 | 90.3 | 1983 | 90.4 | 1982 | 90.6 | 1981 | 90.6 |
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