| Year | Value | | 2022 | 8,950 | | 2021 | 9,201 | | 2020 | 9,507 | | 2019 | 9,809 | | 2018 | 10,025 | | 2017 | 10,153 | | 2016 | 10,237 | | 2015 | 10,308 | | 2014 | 10,335 | | 2013 | 10,179 | | 2012 | 9,935 | | 2011 | 9,664 | | 2010 | 9,415 | | 2009 | 9,258 | | 2008 | 9,179 | | 2007 | 9,127 | | 2006 | 9,141 | | 2005 | 9,088 | | 2004 | 9,106 | | 2003 | 9,297 | | 2002 | 9,437 | | 2001 | 9,502 | | 2000 | 9,509 | | 1999 | 9,447 | | 1998 | 9,327 | | 1997 | 9,191 | | 1996 | 9,004 | | 1995 | 8,762 | | 1994 | 8,493 | | 1993 | 8,193 | | 1992 | 7,880 | | 1991 | 7,563 | | 1990 | 7,242 | | 1989 | 6,876 | | 1988 | 6,528 | | 1987 | 6,260 | | 1986 | 6,026 | | 1985 | 5,828 | | 1984 | 5,692 | | 1983 | 5,603 | | 1982 | 5,538 | | 1981 | 5,500 | | 1980 | 5,500 | | 1979 | 5,553 | | 1978 | 5,623 | | 1977 | 5,654 | | 1976 | 5,633 | | 1975 | 5,592 | | 1974 | 5,509 | | 1973 | 5,349 | | 1972 | 5,149 | | 1971 | 4,859 | | 1970 | 4,501 | | 1969 | 4,135 | | 1968 | 3,908 | | 1967 | 3,773 | | 1966 | 3,654 | | 1965 | 3,543 | | 1964 | 3,463 | | 1963 | 3,387 | | 1962 | 3,315 | | 1961 | 3,247 | | 1960 | 3,178 |
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