| Year | Value | | 2022 | 15,722 | | 2021 | 15,499 | | 2020 | 15,114 | | 2019 | 14,588 | | 2018 | 13,950 | | 2017 | 13,239 | | 2016 | 12,518 | | 2015 | 11,826 | | 2014 | 11,177 | | 2013 | 10,608 | | 2012 | 10,159 | | 2011 | 9,812 | | 2010 | 9,510 | | 2009 | 9,217 | | 2008 | 8,877 | | 2007 | 8,448 | | 2006 | 7,989 | | 2005 | 7,587 | | 2004 | 7,288 | | 2003 | 7,030 | | 2002 | 6,798 | | 2001 | 6,604 | | 2000 | 6,393 | | 1999 | 6,164 | | 1998 | 5,917 | | 1997 | 5,665 | | 1996 | 5,444 | | 1995 | 5,259 | | 1994 | 5,201 | | 1993 | 5,277 | | 1992 | 5,359 | | 1991 | 5,415 | | 1990 | 5,445 | | 1989 | 5,428 | | 1988 | 5,356 | | 1987 | 5,275 | | 1986 | 5,196 | | 1985 | 5,110 | | 1984 | 5,039 | | 1983 | 4,988 | | 1982 | 4,943 | | 1981 | 4,884 | | 1980 | 4,797 | | 1979 | 4,663 | | 1978 | 4,493 | | 1977 | 4,321 | | 1976 | 4,182 | | 1975 | 4,100 | | 1974 | 4,078 | | 1973 | 4,102 | | 1972 | 4,160 | | 1971 | 4,236 | | 1970 | 4,274 | | 1969 | 4,227 | | 1968 | 4,112 | | 1967 | 3,960 | | 1966 | 3,802 | | 1965 | 3,661 | | 1964 | 3,552 | | 1963 | 3,485 | | 1962 | 3,447 | | 1961 | 3,402 | | 1960 | 3,359 |
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