Year | Value | 2022 | 23,558 | 2021 | 22,511 | 2020 | 21,622 | 2019 | 20,314 | 2018 | 18,779 | 2017 | 17,725 | 2016 | 17,024 | 2015 | 16,415 | 2014 | 15,851 | 2013 | 15,367 | 2012 | 14,906 | 2011 | 14,550 | 2010 | 14,468 | 2009 | 14,423 | 2008 | 14,243 | 2007 | 14,068 | 2006 | 13,910 | 2005 | 13,594 | 2004 | 13,133 | 2003 | 12,684 | 2002 | 12,303 | 2001 | 12,007 | 2000 | 11,789 | 1999 | 11,811 | 1998 | 12,057 | 1997 | 12,367 | 1996 | 12,700 | 1995 | 13,181 | 1994 | 13,670 | 1993 | 14,005 | 1992 | 14,273 | 1991 | 14,433 | 1990 | 14,177 | 1989 | 14,020 | 1988 | 13,849 | 1987 | 13,651 | 1986 | 13,458 | 1985 | 13,268 | 1984 | 13,288 | 1983 | 13,693 | 1982 | 13,979 | 1981 | 14,184 | 1980 | 14,444 | 1979 | 14,363 | 1978 | 14,024 | 1977 | 13,391 | 1976 | 12,545 | 1975 | 11,587 | 1974 | 10,660 | 1973 | 9,934 | 1972 | 9,454 | 1971 | 9,309 | 1970 | 9,418 | 1969 | 9,728 | 1968 | 10,163 | 1967 | 10,565 | 1966 | 10,834 | 1965 | 10,936 | 1964 | 10,907 | 1963 | 10,812 | 1962 | 10,738 | 1961 | 10,725 | 1960 | 10,782 |
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