| Year | Value | | 2022 | 37,721 | | 2021 | 35,849 | | 2020 | 34,317 | | 2019 | 32,992 | | 2018 | 31,763 | | 2017 | 30,684 | | 2016 | 29,672 | | 2015 | 28,654 | | 2014 | 27,594 | | 2013 | 26,538 | | 2012 | 25,566 | | 2011 | 24,764 | | 2010 | 24,227 | | 2009 | 23,925 | | 2008 | 23,674 | | 2007 | 23,317 | | 2006 | 22,749 | | 2005 | 21,934 | | 2004 | 20,943 | | 2003 | 19,924 | | 2002 | 19,005 | | 2001 | 18,242 | | 2000 | 17,616 | | 1999 | 16,987 | | 1998 | 16,319 | | 1997 | 15,680 | | 1996 | 15,073 | | 1995 | 14,499 | | 1994 | 13,977 | | 1993 | 13,351 | | 1992 | 12,595 | | 1991 | 11,865 | | 1990 | 11,164 | | 1989 | 10,459 | | 1988 | 9,883 | | 1987 | 9,457 | | 1986 | 9,014 | | 1985 | 8,525 | | 1984 | 8,009 | | 1983 | 7,481 | | 1982 | 7,012 | | 1981 | 6,644 | | 1980 | 6,379 | | 1979 | 6,247 | | 1978 | 6,250 | | 1977 | 6,351 | | 1976 | 6,554 | | 1975 | 6,817 | | 1974 | 7,068 | | 1973 | 7,313 | | 1972 | 7,546 | | 1971 | 7,762 | | 1970 | 7,944 | | 1969 | 8,054 | | 1968 | 8,022 | | 1967 | 7,902 | | 1966 | 7,785 | | 1965 | 7,670 | | 1964 | 7,560 | | 1963 | 7,456 | | 1962 | 7,353 | | 1961 | 7,247 | | 1960 | 7,138 |
|