| Year | Value | | 2023 | 14,623 | | 2022 | 14,171 | | 2021 | 13,755 | | 2020 | 13,351 | | 2019 | 12,946 | | 2018 | 12,539 | | 2017 | 12,126 | | 2016 | 11,803 | | 2015 | 11,572 | | 2014 | 11,315 | | 2013 | 10,970 | | 2012 | 10,474 | | 2011 | 9,899 | | 2010 | 9,375 | | 2009 | 8,953 | | 2008 | 8,683 | | 2007 | 8,576 | | 2006 | 8,566 | | 2005 | 8,559 | | 2004 | 8,444 | | 2003 | 8,155 | | 2002 | 7,549 | | 2001 | 6,786 | | 2000 | 6,234 | | 1999 | 6,064 | | 1998 | 6,194 | | 1997 | 6,341 | | 1996 | 6,416 | | 1995 | 6,436 | | 1994 | 6,410 | | 1993 | 6,353 | | 1992 | 6,271 | | 1991 | 6,132 | | 1990 | 5,931 | | 1989 | 5,702 | | 1988 | 5,459 | | 1987 | 5,213 | | 1986 | 4,970 | | 1985 | 4,739 | | 1984 | 4,534 | | 1983 | 4,355 | | 1982 | 4,203 | | 1981 | 4,081 | | 1980 | 3,989 | | 1979 | 3,927 | | 1978 | 3,896 | | 1977 | 3,892 | | 1976 | 3,902 | | 1975 | 3,924 |
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