| Year | Value | | 2024 | 6,907 | | 2023 | 6,625 | | 2022 | 6,368 | | 2021 | 6,163 | | 2020 | 6,011 | | 2019 | 5,878 | | 2018 | 5,790 | | 2017 | 5,767 | | 2016 | 5,802 | | 2015 | 5,889 | | 2014 | 6,009 | | 2013 | 6,084 | | 2012 | 6,098 | | 2011 | 6,088 | | 2010 | 6,029 | | 2009 | 5,898 | | 2008 | 5,751 | | 2007 | 5,591 | | 2006 | 5,373 | | 2005 | 5,121 | | 2004 | 4,856 | | 2003 | 4,607 | | 2002 | 4,388 | | 2001 | 4,197 | | 2000 | 4,027 | | 1999 | 3,870 | | 1998 | 3,719 | | 1997 | 3,566 | | 1996 | 3,412 | | 1995 | 3,257 | | 1994 | 3,101 | | 1993 | 2,944 | | 1992 | 2,792 | | 1991 | 2,648 | | 1990 | 2,523 | | 1989 | 2,425 | | 1988 | 2,362 | | 1987 | 2,331 | | 1986 | 2,320 | | 1985 | 2,319 | | 1984 | 2,310 | | 1983 | 2,280 | | 1982 | 2,223 | | 1981 | 2,143 | | 1980 | 2,042 | | 1979 | 1,925 | | 1978 | 1,800 | | 1977 | 1,674 | | 1976 | 1,550 | | 1975 | 1,440 |
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