| Year | Value | | 2024 | 2,500 | | 2023 | 2,568 | | 2022 | 2,767 | | 2021 | 2,968 | | 2020 | 3,127 | | 2019 | 3,242 | | 2018 | 3,313 | | 2017 | 3,333 | | 2016 | 3,389 | | 2015 | 3,479 | | 2014 | 3,553 | | 2013 | 3,634 | | 2012 | 3,708 | | 2011 | 3,777 | | 2010 | 3,850 | | 2009 | 3,910 | | 2008 | 3,928 | | 2007 | 3,914 | | 2006 | 3,904 | | 2005 | 3,917 | | 2004 | 3,922 | | 2003 | 3,924 | | 2002 | 3,952 | | 2001 | 4,006 | | 2000 | 4,072 | | 1999 | 4,133 | | 1998 | 4,167 | | 1997 | 4,148 | | 1996 | 4,144 | | 1995 | 4,171 | | 1994 | 4,153 | | 1993 | 4,073 | | 1992 | 3,934 | | 1991 | 3,767 | | 1990 | 3,598 | | 1989 | 3,439 | | 1988 | 3,298 | | 1987 | 3,170 | | 1986 | 3,128 | | 1985 | 3,169 | | 1984 | 3,201 | | 1983 | 3,210 | | 1982 | 3,195 | | 1981 | 3,152 | | 1980 | 3,086 | | 1979 | 3,008 | | 1978 | 2,930 | | 1977 | 2,851 | | 1976 | 2,787 | | 1975 | 2,765 |
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