| Year | Value | | 2022 | 3,753 | | 2021 | 3,809 | | 2020 | 3,883 | | 2019 | 3,985 | | 2018 | 4,112 | | 2017 | 4,228 | | 2016 | 4,324 | | 2015 | 4,365 | | 2014 | 4,338 | | 2013 | 4,298 | | 2012 | 4,268 | | 2011 | 4,268 | | 2010 | 4,339 | | 2009 | 4,485 | | 2008 | 4,664 | | 2007 | 4,851 | | 2006 | 5,027 | | 2005 | 5,154 | | 2004 | 5,213 | | 2003 | 5,231 | | 2002 | 5,231 | | 2001 | 5,237 | | 2000 | 5,274 | | 1999 | 5,328 | | 1998 | 5,370 | | 1997 | 5,380 | | 1996 | 5,354 | | 1995 | 5,302 | | 1994 | 5,240 | | 1993 | 5,192 | | 1992 | 5,177 | | 1991 | 5,206 | | 1990 | 5,294 | | 1989 | 5,428 | | 1988 | 5,560 | | 1987 | 5,665 | | 1986 | 5,741 | | 1985 | 5,793 | | 1984 | 5,804 | | 1983 | 5,757 | | 1982 | 5,644 | | 1981 | 5,454 | | 1980 | 5,238 | | 1979 | 5,053 | | 1978 | 4,893 | | 1977 | 4,743 | | 1976 | 4,614 | | 1975 | 4,510 | | 1974 | 4,427 | | 1973 | 4,301 | | 1972 | 4,129 | | 1971 | 3,946 | | 1970 | 3,729 | | 1969 | 3,480 | | 1968 | 3,282 | | 1967 | 3,162 | | 1966 | 3,082 | | 1965 | 3,060 | | 1964 | 3,092 | | 1963 | 3,154 | | 1962 | 3,221 | | 1961 | 3,278 | | 1960 | 3,327 |
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