Year | Value | 2022 | 45.5 | 2021 | 46.3 | 2020 | 47.2 | 2019 | 46.4 | 2018 | 47.5 | 2017 | 48.9 | 2016 | 50 | 2015 | 50.9 | 2014 | 52.1 | 2013 | 53.2 | 2012 | 55 | 2011 | 56.3 | 2010 | 57.7 | 2009 | 59.4 | 2008 | 60.4 | 2007 | 61.5 | 2006 | 62.9 | 2005 | 64.2 | 2004 | 65.5 | 2003 | 66.8 | 2002 | 67.4 | 2001 | 68.3 | 2000 | 69 | 1999 | 69.8 | 1998 | 69.3 | 1997 | 69.4 | 1996 | 69.9 | 1995 | 69.8 | 1994 | 70.5 | 1993 | 70.5 | 1992 | 70 | 1991 | 69.6 | 1990 | 69.2 | 1989 | 69 | 1988 | 69 | 1987 | 69 | 1986 | 68.6 | 1985 | 69.1 | 1984 | 69.2 | 1983 | 69.1 | 1982 | 68.7 | 1981 | 68.6 |
|