Year | Value | 2023 | 31,810 | 2022 | 30,912 | 2021 | 30,387 | 2020 | 30,173 | 2019 | 30,162 | 2018 | 30,187 | 2017 | 30,048 | 2016 | 29,809 | 2015 | 29,564 | 2014 | 29,289 | 2013 | 28,921 | 2012 | 28,169 | 2011 | 27,030 | 2010 | 25,765 | 2009 | 24,471 | 2008 | 23,248 | 2007 | 22,166 | 2006 | 21,230 | 2005 | 20,401 | 2004 | 19,637 | 2003 | 19,028 | 2002 | 18,546 | 2001 | 18,106 | 2000 | 17,793 | 1999 | 17,637 | 1998 | 17,607 | 1997 | 17,640 | 1996 | 17,691 | 1995 | 17,722 | 1994 | 17,686 | 1993 | 17,573 | 1992 | 17,401 | 1991 | 17,004 | 1990 | 16,391 | 1989 | 15,777 | 1988 | 15,200 | 1987 | 14,666 | 1986 | 14,177 | 1985 | 13,730 | 1984 | 13,299 | 1983 | 12,858 | 1982 | 12,399 | 1981 | 11,905 | 1980 | 11,385 | 1979 | 10,743 | 1978 | 10,000 | 1977 | 9,365 | 1976 | 8,905 | 1975 | 8,581 |
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