| Year | Value | | 2024 | 7,185 | | 2023 | 6,618 | | 2022 | 6,264 | | 2021 | 6,160 | | 2020 | 6,543 | | 2019 | 7,114 | | 2018 | 7,556 | | 2017 | 7,913 | | 2016 | 8,121 | | 2015 | 8,121 | | 2014 | 7,968 | | 2013 | 7,721 | | 2012 | 7,461 | | 2011 | 7,249 | | 2010 | 7,050 | | 2009 | 6,844 | | 2008 | 6,683 | | 2007 | 6,572 | | 2006 | 6,421 | | 2005 | 6,182 | | 2004 | 5,858 | | 2003 | 5,469 | | 2002 | 5,040 | | 2001 | 4,638 | | 2000 | 4,284 | | 1999 | 3,979 | | 1998 | 3,652 | | 1997 | 3,301 | | 1996 | 2,966 | | 1995 | 2,700 | | 1994 | 2,575 | | 1993 | 2,648 | | 1992 | 2,902 | | 1991 | 3,250 | | 1990 | 3,613 | | 1989 | 3,916 | | 1988 | 4,096 | | 1987 | 4,143 | | 1986 | 4,095 | | 1985 | 3,983 | | 1984 | 3,836 | | 1983 | 3,709 | | 1982 | 3,623 | | 1981 | 3,567 | | 1980 | 3,525 | | 1979 | 3,477 | | 1978 | 3,415 | | 1977 | 3,329 | | 1976 | 3,178 | | 1975 | 2,977 |
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