| Year | Value | | 2022 | 33,776 | | 2021 | 33,125 | | 2020 | 32,059 | | 2019 | 30,074 | | 2018 | 28,335 | | 2017 | 27,273 | | 2016 | 26,481 | | 2015 | 25,565 | | 2014 | 24,429 | | 2013 | 23,114 | | 2012 | 21,486 | | 2011 | 19,767 | | 2010 | 18,145 | | 2009 | 16,937 | | 2008 | 16,190 | | 2007 | 15,563 | | 2006 | 15,124 | | 2005 | 14,823 | | 2004 | 14,516 | | 2003 | 14,194 | | 2002 | 13,906 | | 2001 | 13,637 | | 2000 | 13,395 | | 1999 | 13,173 | | 1998 | 12,965 | | 1997 | 12,762 | | 1996 | 12,551 | | 1995 | 12,324 | | 1994 | 12,085 | | 1993 | 11,854 | | 1992 | 11,652 | | 1991 | 11,487 | | 1990 | 11,352 | | 1989 | 11,239 | | 1988 | 11,133 | | 1987 | 11,030 | | 1986 | 10,920 | | 1985 | 10,797 | | 1984 | 10,565 | | 1983 | 10,239 | | 1982 | 9,929 | | 1981 | 9,641 | | 1980 | 9,374 | | 1979 | 9,126 | | 1978 | 8,898 | | 1977 | 8,686 | | 1976 | 8,484 | | 1975 | 8,287 | | 1974 | 8,092 | | 1973 | 7,908 | | 1972 | 7,740 | | 1971 | 7,576 | | 1970 | 7,417 | | 1969 | 7,261 | | 1968 | 7,107 | | 1967 | 6,954 | | 1966 | 6,802 | | 1965 | 6,650 | | 1964 | 6,501 | | 1963 | 6,356 | | 1962 | 6,214 | | 1961 | 6,065 | | 1960 | 5,905 |
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