Year | Value | 2022 | 22,828 | 2021 | 22,727 | 2020 | 22,641 | 2019 | 22,574 | 2018 | 22,539 | 2017 | 22,518 | 2016 | 22,502 | 2015 | 22,485 | 2014 | 22,465 | 2013 | 22,434 | 2012 | 22,380 | 2011 | 22,292 | 2010 | 22,485 | 2009 | 22,670 | 2008 | 22,815 | 2007 | 22,966 | 2006 | 23,141 | 2005 | 23,336 | 2004 | 23,554 | 2003 | 23,785 | 2002 | 24,006 | 2001 | 24,191 | 2000 | 24,113 | 1999 | 23,984 | 1998 | 23,844 | 1997 | 23,659 | 1996 | 23,445 | 1995 | 23,229 | 1994 | 23,029 | 1993 | 22,850 | 1992 | 22,686 | 1991 | 22,568 | 1990 | 22,435 | 1989 | 22,492 | 1988 | 22,563 | 1987 | 22,641 | 1986 | 22,715 | 1985 | 22,780 | 1984 | 22,837 | 1983 | 22,801 | 1982 | 22,687 | 1981 | 22,580 | 1980 | 22,463 | 1979 | 22,315 | 1978 | 22,166 | 1977 | 22,042 | 1976 | 21,947 | 1975 | 21,911 | 1974 | 21,922 | 1973 | 21,954 | 1972 | 21,982 | 1971 | 21,955 | 1970 | 21,819 | 1969 | 21,828 | 1968 | 21,823 | 1967 | 21,824 | 1966 | 21,829 | 1965 | 21,836 | 1964 | 21,829 | 1963 | 21,850 | 1962 | 21,906 | 1961 | 21,958 | 1960 | 21,946 |
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