Year | Value | 2023 | 11,450 | 2022 | 11,422 | 2021 | 11,449 | 2020 | 11,590 | 2019 | 11,855 | 2018 | 12,035 | 2017 | 12,232 | 2016 | 12,534 | 2015 | 12,788 | 2014 | 13,258 | 2013 | 14,104 | 2012 | 14,957 | 2011 | 15,633 | 2010 | 16,198 | 2009 | 16,313 | 2008 | 16,064 | 2007 | 15,825 | 2006 | 15,634 | 2005 | 15,478 | 2004 | 15,320 | 2003 | 15,256 | 2002 | 15,343 | 2001 | 15,480 | 2000 | 15,766 | 1999 | 16,169 | 1998 | 16,543 | 1997 | 16,912 | 1996 | 17,153 | 1995 | 17,120 | 1994 | 16,942 | 1993 | 16,552 | 1992 | 15,907 | 1991 | 15,395 | 1990 | 15,155 | 1989 | 14,939 | 1988 | 14,689 | 1987 | 14,456 | 1986 | 14,138 | 1985 | 13,777 | 1984 | 13,445 | 1983 | 13,141 | 1982 | 12,889 | 1981 | 12,686 | 1980 | 12,500 | 1979 | 12,396 | 1978 | 12,409 | 1977 | 12,487 | 1976 | 12,595 | 1975 | 12,731 | 1974 | 12,847 |
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