Year | Value | 2021 | 71.3 | 2020 | 72.7 | 2019 | 69.9 | 2018 | 68.5 | 2017 | 70.3 | 2016 | 68.7 | 2015 | 70.1 | 2014 | 68.4 | 2013 | 69.9 | 2012 | 69.3 | 2011 | 67.7 | 2010 | 69.1 | 2009 | 68.4 | 2008 | 67.7 | 2007 | 68.9 | 2006 | 68.9 | 2005 | 67.4 | 2004 | 69.1 | 2003 | 66.2 | 2002 | 66.6 | 2001 | 67.4 | 2000 | 67.9 | 1999 | 67.4 | 1998 | 67.6 | 1997 | 65.7 | 1996 | 66 | 1995 | 65.8 | 1994 | 65.9 | 1993 | 64.2 | 1992 | 65.8 | 1991 | 65.2 | 1990 | 62.4 | 1989 | 62.8 | 1988 | 64.8 | 1987 | 63.7 | 1986 | 64.9 | 1985 | 63.6 | 1984 | 65.7 | 1983 | 65.7 | 1982 | 64.3 | 1981 | 67.7 | 1980 | 65.5 |
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