| Year | Value | | 2022 | 3,523 | | 2021 | 3,355 | | 2020 | 3,198 | | 2019 | 3,048 | | 2018 | 2,902 | | 2017 | 2,752 | | 2016 | 2,593 | | 2015 | 2,443 | | 2014 | 2,311 | | 2013 | 2,189 | | 2012 | 2,079 | | 2011 | 1,985 | | 2010 | 1,913 | | 2009 | 1,830 | | 2008 | 1,736 | | 2007 | 1,666 | | 2006 | 1,618 | | 2005 | 1,585 | | 2004 | 1,557 | | 2003 | 1,528 | | 2002 | 1,493 | | 2001 | 1,454 | | 2000 | 1,408 | | 1999 | 1,368 | | 1998 | 1,343 | | 1997 | 1,330 | | 1996 | 1,328 | | 1995 | 1,337 | | 1994 | 1,350 | | 1993 | 1,359 | | 1992 | 1,362 | | 1991 | 1,357 | | 1990 | 1,342 | | 1989 | 1,308 | | 1988 | 1,257 | | 1987 | 1,207 | | 1986 | 1,157 | | 1985 | 1,106 | | 1984 | 1,059 | | 1983 | 1,014 | | 1982 | 969 | | 1981 | 926 | | 1980 | 884 | | 1979 | 859 | | 1978 | 837 | | 1977 | 797 | | 1976 | 752 | | 1975 | 707 | | 1974 | 664 | | 1973 | 627 | | 1972 | 593 | | 1971 | 563 | | 1970 | 540 | | 1969 | 523 | | 1968 | 507 | | 1967 | 492 | | 1966 | 474 | | 1965 | 452 | | 1964 | 429 | | 1963 | 407 | | 1962 | 389 | | 1961 | 379 | | 1960 | 377 |
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