Year | Value | 2022 | 62.859 | 2021 | 62.305 | 2020 | 62.694 | 2019 | 63.085 | 2018 | 63.038 | 2017 | 62.797 | 2016 | 62.191 | 2015 | 61.957 | 2014 | 61.641 | 2013 | 61.221 | 2012 | 60.848 | 2011 | 60.433 | 2010 | 60.259 | 2009 | 59.673 | 2008 | 59.365 | 2007 | 59.024 | 2006 | 58.715 | 2005 | 58.316 | 2004 | 57.759 | 2003 | 57.595 | 2002 | 57.215 | 2001 | 56.903 | 2000 | 56.573 | 1999 | 56.427 | 1998 | 56.176 | 1997 | 55.967 | 1996 | 56.186 | 1995 | 56.302 | 1994 | 55.505 | 1993 | 55.774 | 1992 | 54.452 | 1991 | 55.156 | 1990 | 55.498 | 1989 | 55.273 | 1988 | 55.161 | 1987 | 54.775 | 1986 | 54.481 | 1985 | 54.067 | 1984 | 53.703 | 1983 | 53.18 | 1982 | 52.765 | 1981 | 52.262 | 1980 | 51.947 | 1979 | 51.518 | 1978 | 51.049 | 1977 | 50.568 | 1976 | 50.058 | 1975 | 49.87 | 1974 | 49.524 |
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