Year | Value | 2021 | 5.188 | 2020 | 6.501 | 2019 | 4.987 | 2018 | 5.47 | 2017 | 7.399 | 2016 | 8.634 | 2015 | 13.511 | 2014 | 9.046 | 2013 | 9.698 | 2012 | 8.695 | 2011 | 8.034 | 2010 | 7.63 | 2009 | 7.314 | 2008 | 6.666 | 2007 | 9.745 | 2006 | 10.325 | 2005 | 11.263 | 2004 | 12.205 | 2003 | 11.731 | 2002 | 14.191 | 2001 | 14.93 | 2000 | 15.539 | 1999 | 15.74 | 1998 | 15.5 | 1997 | 16.35 | 1996 | 16.01 | 1995 | 16.23 | 1994 | 15.34 | 1993 | 16.32 | 1992 | 15.75 | 1991 | 15.74 | 1990 | 15.72 | 1988 | 23.03 | 1985 | 33.39 | 1982 | 26.7 | 1981 | 25 | 1980 | 35.51 | 1978 | 23.72 | 1976 | 21.81 | 1975 | 19.65 | 1974 | 20.5 | 1973 | 22.11 | 1972 | 23.18 | 1969 | 17.58 |
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