| Year | Value | | 2023 | 3,418 | | 2022 | 3,438 | | 2021 | 3,443 | | 2020 | 3,428 | | 2019 | 3,374 | | 2018 | 3,282 | | 2017 | 3,161 | | 2016 | 3,022 | | 2015 | 2,868 | | 2014 | 2,709 | | 2013 | 2,586 | | 2012 | 2,540 | | 2011 | 2,576 | | 2010 | 2,666 | | 2009 | 2,757 | | 2008 | 2,779 | | 2007 | 2,687 | | 2006 | 2,504 | | 2005 | 2,296 | | 2004 | 2,122 | | 2003 | 2,034 | | 2002 | 2,050 | | 2001 | 2,124 | | 2000 | 2,183 | | 1999 | 2,198 | | 1998 | 2,169 | | 1997 | 2,123 | | 1996 | 2,079 | | 1995 | 2,033 | | 1994 | 1,978 | | 1993 | 1,921 | | 1992 | 1,858 | | 1991 | 1,788 | | 1990 | 1,726 | | 1989 | 1,674 | | 1988 | 1,626 | | 1987 | 1,581 | | 1986 | 1,540 | | 1985 | 1,498 | | 1984 | 1,461 | | 1983 | 1,431 | | 1982 | 1,404 | | 1981 | 1,380 | | 1980 | 1,358 | | 1979 | 1,324 | | 1978 | 1,272 | | 1977 | 1,205 | | 1976 | 1,131 | | 1975 | 1,053 |
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