| Year | Value | | 2024 | 11,494 | | 2023 | 10,711 | | 2022 | 10,275 | | 2021 | 10,140 | | 2020 | 10,583 | | 2019 | 11,291 | | 2018 | 11,815 | | 2017 | 12,156 | | 2016 | 12,318 | | 2015 | 12,225 | | 2014 | 11,887 | | 2013 | 11,480 | | 2012 | 11,110 | | 2011 | 10,798 | | 2010 | 10,519 | | 2009 | 10,274 | | 2008 | 10,094 | | 2007 | 9,972 | | 2006 | 9,863 | | 2005 | 9,708 | | 2004 | 9,441 | | 2003 | 9,045 | | 2002 | 8,536 | | 2001 | 8,019 | | 2000 | 7,538 | | 1999 | 7,096 | | 1998 | 6,596 | | 1997 | 6,054 | | 1996 | 5,540 | | 1995 | 5,149 | | 1994 | 4,993 | | 1993 | 5,177 | | 1992 | 5,702 | | 1991 | 6,379 | | 1990 | 6,957 | | 1989 | 7,273 | | 1988 | 7,238 | | 1987 | 6,873 | | 1986 | 6,377 | | 1985 | 5,944 | | 1984 | 5,637 | | 1983 | 5,472 | | 1982 | 5,409 | | 1981 | 5,378 | | 1980 | 5,334 | | 1979 | 5,292 | | 1978 | 5,285 | | 1977 | 5,237 | | 1976 | 5,020 | | 1975 | 4,667 |
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