| Year | Value | | 2022 | 18,152 | | 2021 | 16,974 | | 2020 | 15,785 | | 2019 | 14,586 | | 2018 | 13,361 | | 2017 | 12,215 | | 2016 | 11,141 | | 2015 | 10,088 | | 2014 | 9,095 | | 2013 | 8,167 | | 2012 | 7,304 | | 2011 | 6,468 | | 2010 | 5,661 | | 2009 | 5,104 | | 2008 | 4,843 | | 2007 | 4,715 | | 2006 | 4,713 | | 2005 | 4,837 | | 2004 | 4,984 | | 2003 | 5,122 | | 2002 | 5,278 | | 2001 | 5,404 | | 2000 | 5,474 | | 1999 | 5,516 | | 1998 | 5,520 | | 1997 | 5,521 | | 1996 | 5,515 | | 1995 | 5,472 | | 1994 | 5,404 | | 1993 | 5,312 | | 1992 | 5,170 | | 1991 | 5,003 | | 1990 | 4,831 | | 1989 | 4,665 | | 1988 | 4,536 | | 1987 | 4,445 | | 1986 | 4,339 | | 1985 | 4,226 | | 1984 | 4,126 | | 1983 | 4,012 | | 1982 | 3,898 | | 1981 | 3,794 | | 1980 | 3,682 | | 1979 | 3,578 | | 1978 | 3,505 | | 1977 | 3,441 | | 1976 | 3,363 | | 1975 | 3,256 | | 1974 | 3,121 | | 1973 | 2,971 | | 1972 | 2,826 | | 1971 | 2,703 | | 1970 | 2,648 | | 1969 | 2,648 | | 1968 | 2,652 | | 1967 | 2,635 | | 1966 | 2,606 | | 1965 | 2,504 | | 1964 | 2,372 | | 1963 | 2,279 | | 1962 | 2,230 | | 1961 | 2,245 | | 1960 | 2,300 |
|