| Year | Value | | 2022 | 3,476 | | 2021 | 3,356 | | 2020 | 3,258 | | 2019 | 3,215 | | 2018 | 3,158 | | 2017 | 3,093 | | 2016 | 3,074 | | 2015 | 3,031 | | 2014 | 2,955 | | 2013 | 2,861 | | 2012 | 2,752 | | 2011 | 2,641 | | 2010 | 2,554 | | 2009 | 2,494 | | 2008 | 2,460 | | 2007 | 2,451 | | 2006 | 2,460 | | 2005 | 2,482 | | 2004 | 2,501 | | 2003 | 2,505 | | 2002 | 2,511 | | 2001 | 2,512 | | 2000 | 2,481 | | 1999 | 2,423 | | 1998 | 2,351 | | 1997 | 2,281 | | 1996 | 2,229 | | 1995 | 2,200 | | 1994 | 2,194 | | 1993 | 2,211 | | 1992 | 2,255 | | 1991 | 2,294 | | 1990 | 2,343 | | 1989 | 2,402 | | 1988 | 2,431 | | 1987 | 2,428 | | 1986 | 2,398 | | 1985 | 2,358 | | 1984 | 2,326 | | 1983 | 2,307 | | 1982 | 2,300 | | 1981 | 2,294 | | 1980 | 2,281 | | 1979 | 2,249 | | 1978 | 2,195 | | 1977 | 2,122 | | 1976 | 2,038 | | 1975 | 1,950 | | 1974 | 1,861 | | 1973 | 1,777 | | 1972 | 1,698 | | 1971 | 1,628 | | 1970 | 1,562 | | 1969 | 1,499 | | 1968 | 1,439 | | 1967 | 1,384 | | 1966 | 1,336 | | 1965 | 1,297 | | 1964 | 1,265 | | 1963 | 1,242 | | 1962 | 1,227 | | 1961 | 1,216 | | 1960 | 1,193 |
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