Year | Value | 2023 | 19,077 | 2022 | 20,739 | 2021 | 22,435 | 2020 | 23,285 | 2019 | 23,205 | 2018 | 23,042 | 2017 | 22,951 | 2016 | 23,013 | 2015 | 23,262 | 2014 | 23,647 | 2013 | 24,119 | 2012 | 24,705 | 2011 | 25,366 | 2010 | 25,918 | 2009 | 26,263 | 2008 | 26,498 | 2007 | 26,702 | 2006 | 26,986 | 2005 | 27,451 | 2004 | 28,026 | 2003 | 28,585 | 2002 | 29,089 | 2001 | 29,534 | 2000 | 29,969 | 1999 | 30,511 | 1998 | 31,150 | 1997 | 31,787 | 1996 | 32,394 | 1995 | 32,953 | 1994 | 33,382 | 1993 | 33,633 | 1992 | 33,710 | 1991 | 33,563 | 1990 | 33,136 | 1989 | 32,638 | 1988 | 32,252 | 1987 | 31,882 | 1986 | 31,502 | 1985 | 31,126 | 1984 | 30,749 | 1983 | 30,347 | 1982 | 29,905 | 1981 | 29,443 | 1980 | 28,936 | 1979 | 28,511 | 1978 | 28,243 | 1977 | 28,001 | 1976 | 27,672 | 1975 | 27,103 |
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