Year | Value | 2022 | 25,220 | 2021 | 24,653 | 2020 | 24,100 | 2019 | 23,573 | 2018 | 23,188 | 2017 | 22,820 | 2016 | 22,461 | 2015 | 22,271 | 2014 | 22,144 | 2013 | 22,134 | 2012 | 22,088 | 2011 | 21,829 | 2010 | 21,548 | 2009 | 21,531 | 2008 | 21,390 | 2007 | 21,031 | 2006 | 20,588 | 2005 | 20,069 | 2004 | 19,480 | 2003 | 18,934 | 2002 | 18,560 | 2001 | 18,197 | 2000 | 17,676 | 1999 | 17,224 | 1998 | 16,857 | 1997 | 16,456 | 1996 | 16,130 | 1995 | 15,830 | 1994 | 15,506 | 1993 | 15,281 | 1992 | 15,120 | 1991 | 14,936 | 1990 | 14,557 | 1989 | 13,981 | 1988 | 13,513 | 1987 | 13,091 | 1986 | 12,585 | 1985 | 12,311 | 1984 | 12,323 | 1983 | 12,259 | 1982 | 12,198 | 1981 | 12,292 | 1980 | 12,417 | 1979 | 12,405 | 1978 | 12,380 | 1977 | 12,428 | 1976 | 12,572 | 1975 | 12,863 | 1974 | 13,186 | 1973 | 13,426 | 1972 | 13,504 | 1971 | 13,288 | 1970 | 12,783 | 1969 | 12,079 | 1968 | 11,346 | 1967 | 10,662 | 1966 | 10,131 | 1965 | 9,884 | 1964 | 9,762 | 1963 | 9,522 | 1962 | 9,240 | 1961 | 8,993 | 1960 | 8,855 |
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