| Year | Value | | 2022 | 2,355 | | 2021 | 2,530 | | 2020 | 2,707 | | 2019 | 2,826 | | 2018 | 2,892 | | 2017 | 2,955 | | 2016 | 3,017 | | 2015 | 3,071 | | 2014 | 3,121 | | 2013 | 3,172 | | 2012 | 3,217 | | 2011 | 3,252 | | 2010 | 3,299 | | 2009 | 3,309 | | 2008 | 3,253 | | 2007 | 3,175 | | 2006 | 3,093 | | 2005 | 3,028 | | 2004 | 3,071 | | 2003 | 3,201 | | 2002 | 3,324 | | 2001 | 3,438 | | 2000 | 3,522 | | 1999 | 3,516 | | 1998 | 3,424 | | 1997 | 3,297 | | 1996 | 3,161 | | 1995 | 3,040 | | 1994 | 2,996 | | 1993 | 3,026 | | 1992 | 3,085 | | 1991 | 3,163 | | 1990 | 3,234 | | 1989 | 3,295 | | 1988 | 3,341 | | 1987 | 3,369 | | 1986 | 3,382 | | 1985 | 3,377 | | 1984 | 3,350 | | 1983 | 3,313 | | 1982 | 3,272 | | 1981 | 3,242 | | 1980 | 3,226 | | 1979 | 3,206 | | 1978 | 3,182 | | 1977 | 3,157 | | 1976 | 3,135 | | 1975 | 3,120 | | 1974 | 3,122 | | 1973 | 3,148 | | 1972 | 3,200 | | 1971 | 3,298 | | 1970 | 3,445 | | 1969 | 3,614 | | 1968 | 3,797 | | 1967 | 3,977 | | 1966 | 4,126 | | 1965 | 4,236 | | 1964 | 4,324 | | 1963 | 4,390 | | 1962 | 4,446 | | 1961 | 4,487 | | 1960 | 4,489 |
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