| Year | Value | | 2023 | 11,269 | | 2022 | 11,385 | | 2021 | 11,494 | | 2020 | 11,646 | | 2019 | 11,838 | | 2018 | 11,957 | | 2017 | 11,966 | | 2016 | 11,870 | | 2015 | 11,684 | | 2014 | 11,429 | | 2013 | 11,134 | | 2012 | 10,813 | | 2011 | 10,460 | | 2010 | 10,054 | | 2009 | 9,595 | | 2008 | 9,105 | | 2007 | 8,591 | | 2006 | 8,053 | | 2005 | 7,524 | | 2004 | 7,049 | | 2003 | 6,656 | | 2002 | 6,366 | | 2001 | 6,184 | | 2000 | 6,035 | | 1999 | 5,833 | | 1998 | 5,617 | | 1997 | 5,446 | | 1996 | 5,324 | | 1995 | 5,258 | | 1994 | 5,245 | | 1993 | 5,278 | | 1992 | 5,354 | | 1991 | 5,459 | | 1990 | 5,577 | | 1989 | 5,673 | | 1988 | 5,735 | | 1987 | 5,768 | | 1986 | 5,773 | | 1985 | 5,745 | | 1984 | 5,684 | | 1983 | 5,592 | | 1982 | 5,479 | | 1981 | 5,352 | | 1980 | 5,248 | | 1979 | 5,172 | | 1978 | 5,122 | | 1977 | 5,123 | | 1976 | 5,160 | | 1975 | 5,225 |
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