Year | Value | 2021 | 12,600 | 2020 | 12,620 | 2019 | 12,650 | 2018 | 12,640 | 2017 | 12,660 | 2016 | 12,650 | 2015 | 12,620 | 2014 | 12,610 | 2013 | 12,600 | 2012 | 12,670 | 2011 | 11,180 | 2010 | 11,190 | 2009 | 10,130 | 2008 | 10,630 | 2007 | 10,760 | 2006 | 12,240 | 2005 | 12,280 | 2004 | 12,620 | 2003 | 13,010 | 2002 | 13,340 | 2001 | 12,420 | 2000 | 12,350 | 1999 | 12,820 | 1998 | 12,910 | 1997 | 12,830 | 1996 | 12,900 | 1995 | 12,870 | 1994 | 12,960 | 1993 | 12,970 | 1992 | 13,070 | 1991 | 13,070 | 1990 | 13,070 | 1989 | 13,070 | 1988 | 13,070 | 1987 | 13,070 | 1986 | 13,070 | 1985 | 13,070 | 1984 | 13,070 | 1983 | 13,070 | 1982 | 13,070 | 1981 | 13,070 | 1980 | 13,070 | 1979 | 13,070 | 1978 | 13,070 | 1977 | 13,070 | 1976 | 13,070 | 1975 | 13,070 | 1974 | 13,070 | 1973 | 13,070 | 1972 | 13,070 | 1971 | 13,070 | 1970 | 13,070 | 1969 | 13,070 | 1968 | 13,070 | 1967 | 13,070 | 1966 | 13,070 | 1965 | 13,070 | 1964 | 13,070 | 1963 | 13,070 | 1962 | 13,070 | 1961 | 13,070 |
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