Year | Value | 2023 | 15,995 | 2022 | 16,327 | 2021 | 16,502 | 2020 | 16,478 | 2019 | 16,338 | 2018 | 16,021 | 2017 | 15,529 | 2016 | 15,079 | 2015 | 14,737 | 2014 | 14,399 | 2013 | 14,099 | 2012 | 13,848 | 2011 | 13,629 | 2010 | 13,428 | 2009 | 13,263 | 2008 | 13,149 | 2007 | 13,069 | 2006 | 13,030 | 2005 | 13,068 | 2004 | 13,166 | 2003 | 13,297 | 2002 | 13,467 | 2001 | 13,675 | 2000 | 13,872 | 1999 | 14,044 | 1998 | 14,197 | 1997 | 14,298 | 1996 | 14,328 | 1995 | 14,295 | 1994 | 14,194 | 1993 | 13,998 | 1992 | 13,692 | 1991 | 13,289 | 1990 | 12,809 | 1989 | 12,259 | 1988 | 11,678 | 1987 | 11,128 | 1986 | 10,628 | 1985 | 10,174 | 1984 | 9,770 | 1983 | 9,414 | 1982 | 9,090 | 1981 | 8,787 | 1980 | 8,515 | 1979 | 8,281 | 1978 | 8,108 | 1977 | 8,018 | 1976 | 8,023 | 1975 | 8,132 | 1974 | 8,329 |
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