| Year | Value | | 2024 | 14,016 | | 2023 | 14,031 | | 2022 | 14,050 | | 2021 | 14,064 | | 2020 | 14,070 | | 2019 | 14,110 | | 2018 | 14,171 | | 2017 | 14,219 | | 2016 | 14,257 | | 2015 | 14,285 | | 2014 | 14,302 | | 2013 | 14,308 | | 2012 | 14,412 | | 2011 | 14,639 | | 2010 | 14,839 | | 2009 | 15,008 | | 2008 | 15,143 | | 2007 | 15,252 | | 2006 | 15,343 | | 2005 | 15,374 | | 2004 | 15,151 | | 2003 | 14,655 | | 2002 | 14,117 | | 2001 | 13,650 | | 2000 | 13,346 | | 1999 | 13,172 | | 1998 | 12,998 | | 1997 | 12,814 | | 1996 | 12,578 | | 1995 | 12,276 | | 1994 | 11,945 | | 1993 | 11,604 | | 1992 | 11,261 | | 1991 | 10,922 | | 1990 | 10,610 | | 1989 | 10,344 | | 1988 | 10,097 | | 1987 | 9,843 | | 1986 | 9,581 | | 1985 | 9,279 | | 1984 | 8,910 | | 1983 | 8,525 | | 1982 | 8,156 | | 1981 | 7,833 | | 1980 | 7,669 | | 1979 | 7,663 | | 1978 | 7,691 | | 1977 | 7,715 | | 1976 | 7,732 | | 1975 | 7,736 |
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