| Year | Value | | 2022 | 5,737 | | 2021 | 5,829 | | 2020 | 5,826 | | 2019 | 5,740 | | 2018 | 5,591 | | 2017 | 5,383 | | 2016 | 5,124 | | 2015 | 4,841 | | 2014 | 4,553 | | 2013 | 4,272 | | 2012 | 4,028 | | 2011 | 3,854 | | 2010 | 3,742 | | 2009 | 3,678 | | 2008 | 3,654 | | 2007 | 3,645 | | 2006 | 3,633 | | 2005 | 3,603 | | 2004 | 3,562 | | 2003 | 3,523 | | 2002 | 3,507 | | 2001 | 3,530 | | 2000 | 3,605 | | 1999 | 3,729 | | 1998 | 3,872 | | 1997 | 4,008 | | 1996 | 4,109 | | 1995 | 4,175 | | 1994 | 4,199 | | 1993 | 4,167 | | 1992 | 4,092 | | 1991 | 3,979 | | 1990 | 3,848 | | 1989 | 3,709 | | 1988 | 3,563 | | 1987 | 3,406 | | 1986 | 3,237 | | 1985 | 3,050 | | 1984 | 2,846 | | 1983 | 2,652 | | 1982 | 2,476 | | 1981 | 2,319 | | 1980 | 2,200 | | 1979 | 2,138 | | 1978 | 2,091 | | 1977 | 2,022 | | 1976 | 1,942 | | 1975 | 1,862 | | 1974 | 1,789 | | 1973 | 1,737 | | 1972 | 1,707 | | 1971 | 1,691 | | 1970 | 1,696 | | 1969 | 1,750 | | 1968 | 1,825 | | 1967 | 1,879 | | 1966 | 1,920 | | 1965 | 1,953 | | 1964 | 1,976 | | 1963 | 1,991 | | 1962 | 1,993 | | 1961 | 1,982 | | 1960 | 1,957 |
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