| Year | Value | | 2024 | 3,679 | | 2023 | 3,696 | | 2022 | 3,709 | | 2021 | 3,719 | | 2020 | 3,722 | | 2019 | 3,688 | | 2018 | 3,643 | | 2017 | 3,593 | | 2016 | 3,540 | | 2015 | 3,485 | | 2014 | 3,413 | | 2013 | 3,340 | | 2012 | 3,353 | | 2011 | 3,439 | | 2010 | 3,557 | | 2009 | 3,701 | | 2008 | 3,866 | | 2007 | 4,050 | | 2006 | 4,250 | | 2005 | 4,445 | | 2004 | 4,669 | | 2003 | 5,004 | | 2002 | 5,386 | | 2001 | 5,702 | | 2000 | 5,832 | | 1999 | 5,729 | | 1998 | 5,526 | | 1997 | 5,294 | | 1996 | 5,076 | | 1995 | 4,919 | | 1994 | 4,825 | | 1993 | 4,768 | | 1992 | 4,728 | | 1991 | 4,692 | | 1990 | 4,649 | | 1989 | 4,601 | | 1988 | 4,548 | | 1987 | 4,491 | | 1986 | 4,443 | | 1985 | 4,409 | | 1984 | 4,427 | | 1983 | 4,481 | | 1982 | 4,538 | | 1981 | 4,569 | | 1980 | 4,602 | | 1979 | 4,674 | | 1978 | 4,749 | | 1977 | 4,810 | | 1976 | 4,866 | | 1975 | 4,919 |
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