Year | Value | 2021 | 29,378 | 2020 | 29,428 | 2019 | 29,750 | 2018 | 29,470 | 2017 | 29,353 | 2016 | 29,539 | 2015 | 30,059 | 2014 | 29,524 | 2013 | 28,914 | 2012 | 28,422 | 2011 | 28,059 | 2010 | 27,723 | 2009 | 26,890 | 2008 | 26,721 | 2007 | 26,959 | 2006 | 27,907 | 2005 | 28,370 | 2004 | 26,043 | 2003 | 25,410 | 2002 | 28,850 | 2001 | 28,960 | 2000 | 34,180 | 1999 | 34,960 | 1998 | 34,250 | 1997 | 34,170 | 1996 | 34,110 | 1995 | 34,100 | 1994 | 31,260 | 1993 | 33,330 | 1992 | 33,890 | 1991 | 33,890 | 1990 | 33,890 | 1989 | 33,890 | 1988 | 33,890 | 1987 | 33,890 | 1986 | 33,890 | 1985 | 33,890 | 1984 | 33,890 | 1983 | 33,890 | 1982 | 33,890 | 1981 | 33,890 | 1980 | 33,890 | 1979 | 33,890 | 1978 | 33,890 | 1977 | 33,890 | 1976 | 33,890 | 1975 | 33,890 | 1974 | 33,890 | 1973 | 33,890 | 1972 | 33,890 | 1971 | 33,890 | 1970 | 33,890 | 1969 | 33,890 | 1968 | 33,890 | 1967 | 33,890 | 1966 | 33,890 | 1965 | 33,890 | 1964 | 33,890 | 1963 | 33,890 | 1962 | 33,890 | 1961 | 33,890 |
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