Year | Value | 2023 | 16,705 | 2022 | 17,039 | 2021 | 17,244 | 2020 | 17,288 | 2019 | 17,208 | 2018 | 16,917 | 2017 | 16,449 | 2016 | 16,017 | 2015 | 15,679 | 2014 | 15,335 | 2013 | 15,019 | 2012 | 14,740 | 2011 | 14,474 | 2010 | 14,198 | 2009 | 13,945 | 2008 | 13,754 | 2007 | 13,600 | 2006 | 13,481 | 2005 | 13,467 | 2004 | 13,537 | 2003 | 13,634 | 2002 | 13,784 | 2001 | 13,989 | 2000 | 14,180 | 1999 | 14,343 | 1998 | 14,498 | 1997 | 14,599 | 1996 | 14,624 | 1995 | 14,579 | 1994 | 14,458 | 1993 | 14,233 | 1992 | 13,900 | 1991 | 13,480 | 1990 | 12,991 | 1989 | 12,429 | 1988 | 11,830 | 1987 | 11,254 | 1986 | 10,705 | 1985 | 10,189 | 1984 | 9,732 | 1983 | 9,343 | 1982 | 9,014 | 1981 | 8,738 | 1980 | 8,514 | 1979 | 8,362 | 1978 | 8,297 | 1977 | 8,300 | 1976 | 8,359 | 1975 | 8,460 |
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