Year | Value | 2022 | 70.757 | 2021 | 68.121 | 2020 | 69.102 | 2019 | 68.445 | 2018 | 70.225 | 2017 | 70.04 | 2016 | 70.067 | 2015 | 69.76 | 2014 | 70.013 | 2013 | 69.684 | 2012 | 69.509 | 2011 | 69.301 | 2010 | 69.278 | 2009 | 69.068 | 2008 | 69.319 | 2007 | 69.417 | 2006 | 69.473 | 2005 | 69.434 | 2004 | 69.183 | 2003 | 69.078 | 2002 | 68.922 | 2001 | 68.794 | 2000 | 68.826 | 1999 | 68.571 | 1998 | 68.19 | 1997 | 67.667 | 1996 | 67.409 | 1995 | 67.459 | 1994 | 67.626 | 1993 | 67.371 | 1992 | 67.421 | 1991 | 65.766 | 1990 | 66.845 | 1989 | 66.349 | 1988 | 65.811 | 1987 | 65.511 | 1986 | 65.803 | 1985 | 65.763 | 1984 | 66.036 | 1983 | 66.147 | 1982 | 65.233 | 1981 | 64.432 | 1980 | 64.241 | 1979 | 64.025 | 1978 | 64.142 | 1977 | 64.727 | 1976 | 64.843 | 1975 | 64.056 | 1974 | 63.896 |
|