| Year | Value | | 2022 | 2,652 | | 2021 | 2,791 | | 2020 | 2,907 | | 2019 | 2,988 | | 2018 | 3,024 | | 2017 | 3,037 | | 2016 | 3,038 | | 2015 | 3,037 | | 2014 | 3,045 | | 2013 | 3,065 | | 2012 | 3,094 | | 2011 | 3,130 | | 2010 | 3,175 | | 2009 | 3,225 | | 2008 | 3,283 | | 2007 | 3,353 | | 2006 | 3,432 | | 2005 | 3,513 | | 2004 | 3,579 | | 2003 | 3,630 | | 2002 | 3,671 | | 2001 | 3,702 | | 2000 | 3,711 | | 1999 | 3,729 | | 1998 | 3,734 | | 1997 | 3,672 | | 1996 | 3,600 | | 1995 | 3,548 | | 1994 | 3,499 | | 1993 | 3,441 | | 1992 | 3,382 | | 1991 | 3,306 | | 1990 | 3,274 | | 1989 | 3,254 | | 1988 | 3,335 | | 1987 | 3,427 | | 1986 | 3,558 | | 1985 | 3,672 | | 1984 | 3,737 | | 1983 | 3,805 | | 1982 | 3,818 | | 1981 | 3,715 | | 1980 | 3,579 | | 1979 | 3,371 | | 1978 | 3,290 | | 1977 | 3,151 | | 1976 | 3,233 | | 1975 | 3,145 | | 1974 | 2,949 | | 1973 | 2,721 | | 1972 | 2,453 | | 1971 | 2,285 | | 1970 | 2,041 | | 1969 | 1,927 | | 1968 | 1,783 | | 1967 | 1,586 | | 1966 | 1,511 | | 1965 | 1,441 | | 1964 | 1,345 | | 1963 | 1,288 | | 1962 | 1,122 | | 1961 | 1,102 | | 1960 | 971 |
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