Year | Value | 2022 | 10.547 | 2021 | 13.898 | 2020 | 15.983 | 2019 | 10.28 | 2018 | 9.36 | 2017 | 9.086 | 2016 | 8.922 | 2015 | 8.572 | 2014 | 8.799 | 2013 | 9.246 | 2012 | 9.959 | 2011 | 10.288 | 2010 | 11.153 | 2009 | 12.066 | 2008 | 11.273 | 2007 | 11.204 | 2005 | 11.062 | 2004 | 13.717 | 2003 | 13.221 | 2002 | 14.481 | 2001 | 15.04 | 2000 | 20.52 | 1999 | 20.06 | 1998 | 15 | 1997 | 12.14 | 1996 | 11.81 | 1995 | 8.72 | 1994 | 8.25 | 1993 | 4.37 | 1992 | 9.44 | 1991 | 10.12 | 1987 | 10.83 | 1986 | 12.94 | 1985 | 13.89 | 1984 | 13 | 1983 | 11.13 | 1982 | 11.46 | 1981 | 8.13 | 1980 | 9.1 | 1977 | 9.4 | 1975 | 10.55 |
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