Year | Value | 2022 | 21,514 | 2021 | 21,994 | 2020 | 22,525 | 2019 | 22,595 | 2018 | 22,414 | 2017 | 22,199 | 2016 | 21,685 | 2015 | 21,381 | 2014 | 21,478 | 2013 | 21,728 | 2012 | 22,099 | 2011 | 22,440 | 2010 | 22,752 | 2009 | 23,036 | 2008 | 23,297 | 2007 | 23,547 | 2006 | 23,807 | 2005 | 24,084 | 2004 | 24,364 | 2003 | 24,567 | 2002 | 24,552 | 2001 | 24,509 | 2000 | 24,479 | 1999 | 24,296 | 1998 | 23,913 | 1997 | 23,690 | 1996 | 23,485 | 1995 | 23,495 | 1994 | 23,522 | 1993 | 22,941 | 1992 | 22,176 | 1991 | 21,368 | 1990 | 20,618 | 1989 | 19,873 | 1988 | 19,101 | 1987 | 18,338 | 1986 | 17,597 | 1985 | 16,922 | 1984 | 16,257 | 1983 | 15,620 | 1982 | 15,052 | 1981 | 14,537 | 1980 | 14,129 | 1979 | 13,749 | 1978 | 13,207 | 1977 | 12,509 | 1976 | 11,793 | 1975 | 11,096 | 1974 | 10,504 | 1973 | 10,234 | 1972 | 10,390 | 1971 | 10,736 | 1970 | 11,066 | 1969 | 11,368 | 1968 | 11,631 | 1967 | 11,869 | 1966 | 12,113 | 1965 | 12,358 | 1964 | 12,600 | 1963 | 12,840 | 1962 | 13,072 | 1961 | 13,293 | 1960 | 13,505 |
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