Year | Value | 2021 | 23,799 | 2020 | 23,779 | 2019 | 23,726 | 2018 | 23,742 | 2017 | 23,848 | 2016 | 23,940 | 2015 | 24,181 | 2014 | 24,160 | 2013 | 24,861 | 2012 | 24,350 | 2011 | 24,424 | 2010 | 24,600 | 2009 | 24,980 | 2008 | 25,140 | 2007 | 25,170 | 2006 | 25,180 | 2005 | 25,200 | 2004 | 24,920 | 2003 | 30,060 | 2002 | 30,040 | 2001 | 30,030 | 2000 | 30,000 | 1999 | 29,990 | 1998 | 30,450 | 1997 | 30,370 | 1996 | 30,350 | 1995 | 30,480 | 1994 | 30,970 | 1993 | 31,280 | 1992 | 32,290 | 1991 | 32,290 | 1990 | 32,290 | 1989 | 32,290 | 1988 | 32,290 | 1987 | 32,290 | 1986 | 32,290 | 1985 | 32,290 | 1984 | 32,290 | 1983 | 32,290 | 1982 | 32,290 | 1981 | 32,290 | 1980 | 32,290 | 1979 | 32,290 | 1978 | 32,290 | 1977 | 32,290 | 1976 | 32,290 | 1975 | 32,290 | 1974 | 32,290 | 1973 | 32,290 | 1972 | 32,290 | 1971 | 32,290 | 1970 | 32,290 | 1969 | 32,290 | 1968 | 32,290 | 1967 | 32,290 | 1966 | 32,290 | 1965 | 32,290 | 1964 | 32,290 | 1963 | 32,290 | 1962 | 32,290 | 1961 | 32,290 |
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