Year | Value | 2021 | 75.6 | 2020 | 82 | 2019 | 78.4 | 2018 | 77.4 | 2017 | 78.5 | 2016 | 80.2 | 2015 | 78.7 | 2014 | 78.3 | 2013 | 76.5 | 2012 | 79.5 | 2011 | 78 | 2010 | 77.5 | 2009 | 78 | 2008 | 78.9 | 2007 | 77.6 | 2006 | 75.7 | 2005 | 77.1 | 2004 | 76.4 | 2003 | 76.1 | 2002 | 75.8 | 2001 | 79.4 | 2000 | 77.9 | 1999 | 78.2 | 1998 | 76.1 | 1997 | 77 | 1996 | 77.4 | 1995 | 79.5 | 1994 | 75.8 | 1993 | 75 | 1992 | 76.9 | 1991 | 76.5 | 1990 | 74.1 | 1989 | 73.4 | 1988 | 72.8 | 1987 | 73 | 1986 | 72.6 | 1985 | 76.1 | 1984 | 73.6 | 1983 | 75.3 | 1982 | 74.6 | 1981 | 72.8 | 1980 | 73.9 |
|