| Year | Value | | 2022 | 16,386 | | 2021 | 16,151 | | 2020 | 15,838 | | 2019 | 15,088 | | 2018 | 14,110 | | 2017 | 13,451 | | 2016 | 13,043 | | 2015 | 12,832 | | 2014 | 12,835 | | 2013 | 12,962 | | 2012 | 13,110 | | 2011 | 13,300 | | 2010 | 13,503 | | 2009 | 13,644 | | 2008 | 13,799 | | 2007 | 13,965 | | 2006 | 14,091 | | 2005 | 14,186 | | 2004 | 14,245 | | 2003 | 14,246 | | 2002 | 14,207 | | 2001 | 14,173 | | 2000 | 14,131 | | 1999 | 14,056 | | 1998 | 13,946 | | 1997 | 13,812 | | 1996 | 13,671 | | 1995 | 13,531 | | 1994 | 13,390 | | 1993 | 13,256 | | 1992 | 13,118 | | 1991 | 12,943 | | 1990 | 12,711 | | 1989 | 12,415 | | 1988 | 12,062 | | 1987 | 11,671 | | 1986 | 11,270 | | 1985 | 10,876 | | 1984 | 10,495 | | 1983 | 10,133 | | 1982 | 9,793 | | 1981 | 9,478 | | 1980 | 9,212 | | 1979 | 9,010 | | 1978 | 8,868 | | 1977 | 8,779 | | 1976 | 8,723 | | 1975 | 8,667 | | 1974 | 8,595 | | 1973 | 8,500 | | 1972 | 8,369 | | 1971 | 8,205 | | 1970 | 8,021 | | 1969 | 7,824 | | 1968 | 7,596 | | 1967 | 7,335 | | 1966 | 7,028 | | 1965 | 6,672 | | 1964 | 6,303 | | 1963 | 5,966 | | 1962 | 5,687 | | 1961 | 5,505 | | 1960 | 5,450 |
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