| Year | Value | | 2022 | 15,335 | | 2021 | 14,483 | | 2020 | 13,784 | | 2019 | 13,056 | | 2018 | 12,571 | | 2017 | 12,286 | | 2016 | 11,996 | | 2015 | 11,726 | | 2014 | 11,495 | | 2013 | 11,308 | | 2012 | 11,163 | | 2011 | 11,032 | | 2010 | 10,888 | | 2009 | 10,742 | | 2008 | 10,605 | | 2007 | 10,468 | | 2006 | 10,329 | | 2005 | 10,182 | | 2004 | 10,003 | | 2003 | 9,772 | | 2002 | 9,515 | | 2001 | 9,298 | | 2000 | 9,157 | | 1999 | 9,081 | | 1998 | 9,076 | | 1997 | 9,096 | | 1996 | 9,038 | | 1995 | 8,842 | | 1994 | 8,527 | | 1993 | 8,104 | | 1992 | 7,600 | | 1991 | 7,094 | | 1990 | 6,638 | | 1989 | 6,227 | | 1988 | 5,839 | | 1987 | 5,485 | | 1986 | 5,175 | | 1985 | 4,908 | | 1984 | 4,690 | | 1983 | 4,539 | | 1982 | 4,442 | | 1981 | 4,382 | | 1980 | 4,364 | | 1979 | 4,391 | | 1978 | 4,470 | | 1977 | 4,576 | | 1976 | 4,652 | | 1975 | 4,651 | | 1974 | 4,565 | | 1973 | 4,390 | | 1972 | 4,163 | | 1971 | 3,972 | | 1970 | 3,869 | | 1969 | 3,844 | | 1968 | 3,896 | | 1967 | 4,006 | | 1966 | 4,110 | | 1965 | 4,174 | | 1964 | 4,207 | | 1963 | 4,217 | | 1962 | 4,196 | | 1961 | 4,155 | | 1960 | 4,109 |
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