| Year | Value | | 2022 | 10,342 | | 2021 | 10,223 | | 2020 | 10,051 | | 2019 | 9,827 | | 2018 | 9,598 | | 2017 | 9,337 | | 2016 | 8,959 | | 2015 | 8,536 | | 2014 | 8,192 | | 2013 | 7,909 | | 2012 | 7,633 | | 2011 | 7,366 | | 2010 | 7,067 | | 2009 | 6,762 | | 2008 | 6,485 | | 2007 | 6,172 | | 2006 | 5,836 | | 2005 | 5,560 | | 2004 | 5,311 | | 2003 | 5,102 | | 2002 | 5,054 | | 2001 | 5,138 | | 2000 | 5,200 | | 1999 | 5,214 | | 1998 | 5,201 | | 1997 | 5,147 | | 1996 | 5,045 | | 1995 | 4,974 | | 1994 | 4,977 | | 1993 | 5,004 | | 1992 | 5,028 | | 1991 | 5,040 | | 1990 | 5,044 | | 1989 | 5,053 | | 1988 | 5,051 | | 1987 | 5,027 | | 1986 | 4,994 | | 1985 | 4,965 | | 1984 | 4,946 | | 1983 | 4,949 | | 1982 | 4,980 | | 1981 | 5,026 | | 1980 | 5,076 | | 1979 | 5,153 | | 1978 | 5,261 | | 1977 | 5,361 | | 1976 | 5,417 | | 1975 | 5,414 | | 1974 | 5,351 | | 1973 | 5,217 | | 1972 | 5,044 | | 1971 | 4,916 | | 1970 | 4,875 | | 1969 | 4,911 | | 1968 | 5,034 | | 1967 | 5,208 | | 1966 | 5,322 | | 1965 | 5,306 | | 1964 | 5,163 | | 1963 | 4,899 | | 1962 | 4,543 | | 1961 | 4,187 | | 1960 | 3,914 |
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