Year | Value | 2022 | 24,563 | 2021 | 24,397 | 2020 | 24,402 | 2019 | 24,470 | 2018 | 24,276 | 2017 | 23,851 | 2016 | 23,116 | 2015 | 22,288 | 2014 | 21,361 | 2013 | 20,425 | 2012 | 19,648 | 2011 | 18,886 | 2010 | 18,121 | 2009 | 17,527 | 2008 | 16,943 | 2007 | 16,396 | 2006 | 15,963 | 2005 | 15,566 | 2004 | 15,172 | 2003 | 14,874 | 2002 | 14,619 | 2001 | 14,370 | 2000 | 14,181 | 1999 | 13,815 | 1998 | 13,310 | 1997 | 12,894 | 1996 | 12,368 | 1995 | 11,997 | 1994 | 11,952 | 1993 | 11,786 | 1992 | 11,569 | 1991 | 11,573 | 1990 | 11,610 | 1989 | 11,463 | 1988 | 11,346 | 1987 | 11,330 | 1986 | 11,395 | 1985 | 11,650 | 1984 | 12,001 | 1983 | 12,301 | 1982 | 12,538 | 1981 | 12,556 | 1980 | 12,188 | 1979 | 11,576 | 1978 | 10,899 | 1977 | 10,255 | 1976 | 9,775 | 1975 | 9,530 | 1974 | 9,365 | 1973 | 9,052 | 1972 | 8,731 | 1971 | 8,492 | 1970 | 8,377 | 1969 | 8,606 | 1968 | 9,141 | 1967 | 9,861 | 1966 | 10,528 | 1965 | 10,977 | 1964 | 11,188 | 1963 | 11,317 | 1962 | 11,430 | 1961 | 11,510 | 1960 | 11,559 |
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