| Year | Value | | 2023 | 2,252 | | 2022 | 2,419 | | 2021 | 2,541 | | 2020 | 2,637 | | 2019 | 2,719 | | 2018 | 2,765 | | 2017 | 2,774 | | 2016 | 2,799 | | 2015 | 2,814 | | 2014 | 2,791 | | 2013 | 2,799 | | 2012 | 2,826 | | 2011 | 2,898 | | 2010 | 3,002 | | 2009 | 3,093 | | 2008 | 3,166 | | 2007 | 3,190 | | 2006 | 3,190 | | 2005 | 3,169 | | 2004 | 3,106 | | 2003 | 3,000 | | 2002 | 2,860 | | 2001 | 2,712 | | 2000 | 2,571 | | 1999 | 2,447 | | 1998 | 2,348 | | 1997 | 2,268 | | 1996 | 2,225 | | 1995 | 2,212 | | 1994 | 2,193 | | 1993 | 2,163 | | 1992 | 2,128 | | 1991 | 2,084 | | 1990 | 2,024 | | 1989 | 1,957 | | 1988 | 1,905 | | 1987 | 1,875 | | 1986 | 1,897 | | 1985 | 1,957 | | 1984 | 2,000 | | 1983 | 2,023 | | 1982 | 2,041 | | 1981 | 2,067 | | 1980 | 2,106 | | 1979 | 2,153 | | 1978 | 2,203 | | 1977 | 2,246 | | 1976 | 2,270 | | 1975 | 2,272 |
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