| Year | Value | | 2023 | 6,628 | | 2022 | 6,286 | | 2021 | 5,929 | | 2020 | 5,595 | | 2019 | 5,284 | | 2018 | 4,999 | | 2017 | 4,807 | | 2016 | 4,690 | | 2015 | 4,514 | | 2014 | 4,308 | | 2013 | 4,171 | | 2012 | 4,071 | | 2011 | 3,949 | | 2010 | 3,839 | | 2009 | 3,781 | | 2008 | 3,707 | | 2007 | 3,566 | | 2006 | 3,423 | | 2005 | 3,329 | | 2004 | 3,230 | | 2003 | 3,116 | | 2002 | 3,013 | | 2001 | 2,892 | | 2000 | 2,735 | | 1999 | 2,594 | | 1998 | 2,480 | | 1997 | 2,361 | | 1996 | 2,263 | | 1995 | 2,188 | | 1994 | 2,097 | | 1993 | 2,001 | | 1992 | 1,925 | | 1991 | 1,873 | | 1990 | 1,819 | | 1989 | 1,812 | | 1988 | 1,889 | | 1987 | 1,972 | | 1986 | 2,018 | | 1985 | 2,031 | | 1984 | 2,010 | | 1983 | 1,963 | | 1982 | 1,916 | | 1981 | 1,875 | | 1980 | 1,828 | | 1979 | 1,773 | | 1978 | 1,707 | | 1977 | 1,621 | | 1976 | 1,520 | | 1975 | 1,423 | | 1974 | 1,334 |
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