| Year | Value | | 2023 | 5,727 | | 2022 | 5,308 | | 2021 | 4,979 | | 2020 | 4,711 | | 2019 | 4,455 | | 2018 | 4,197 | | 2017 | 3,928 | | 2016 | 3,644 | | 2015 | 3,371 | | 2014 | 3,128 | | 2013 | 2,934 | | 2012 | 2,807 | | 2011 | 2,755 | | 2010 | 2,786 | | 2009 | 2,908 | | 2008 | 3,071 | | 2007 | 3,225 | | 2006 | 3,349 | | 2005 | 3,430 | | 2004 | 3,465 | | 2003 | 3,466 | | 2002 | 3,454 | | 2001 | 3,435 | | 2000 | 3,424 | | 1999 | 3,429 | | 1998 | 3,430 | | 1997 | 3,411 | | 1996 | 3,373 | | 1995 | 3,312 | | 1994 | 3,231 | | 1993 | 3,134 | | 1992 | 3,024 | | 1991 | 2,913 | | 1990 | 2,808 | | 1989 | 2,738 | | 1988 | 2,706 | | 1987 | 2,680 | | 1986 | 2,658 | | 1985 | 2,648 | | 1984 | 2,646 | | 1983 | 2,651 | | 1982 | 2,664 | | 1981 | 2,682 | | 1980 | 2,704 | | 1979 | 2,809 | | 1978 | 2,988 | | 1977 | 3,156 | | 1976 | 3,317 | | 1975 | 3,469 |
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