| Year | Value | | 2022 | 17,283 | | 2021 | 17,111 | | 2020 | 17,035 | | 2019 | 17,022 | | 2018 | 16,979 | | 2017 | 16,836 | | 2016 | 16,552 | | 2015 | 16,126 | | 2014 | 15,593 | | 2013 | 15,021 | | 2012 | 14,475 | | 2011 | 13,965 | | 2010 | 13,502 | | 2009 | 13,093 | | 2008 | 12,709 | | 2007 | 12,312 | | 2006 | 11,856 | | 2005 | 11,305 | | 2004 | 10,687 | | 2003 | 9,959 | | 2002 | 9,218 | | 2001 | 8,649 | | 2000 | 8,223 | | 1999 | 7,869 | | 1998 | 7,545 | | 1997 | 7,240 | | 1996 | 6,955 | | 1995 | 6,689 | | 1994 | 6,555 | | 1993 | 6,577 | | 1992 | 6,628 | | 1991 | 6,674 | | 1990 | 6,726 | | 1989 | 6,754 | | 1988 | 6,738 | | 1987 | 6,713 | | 1986 | 6,676 | | 1985 | 6,598 | | 1984 | 6,503 | | 1983 | 6,405 | | 1982 | 6,311 | | 1981 | 6,218 | | 1980 | 6,133 | | 1979 | 6,045 | | 1978 | 5,954 | | 1977 | 5,868 | | 1976 | 5,769 | | 1975 | 5,643 | | 1974 | 5,483 | | 1973 | 5,303 | | 1972 | 5,118 | | 1971 | 4,906 | | 1970 | 4,698 | | 1969 | 4,563 | | 1968 | 4,499 | | 1967 | 4,498 | | 1966 | 4,531 | | 1965 | 4,557 | | 1964 | 4,535 | | 1963 | 4,432 | | 1962 | 4,304 | | 1961 | 4,235 | | 1960 | 4,196 |
|