| Year | Value | | 2022 | 5,760 | | 2021 | 5,803 | | 2020 | 5,851 | | 2019 | 5,883 | | 2018 | 5,923 | | 2017 | 5,974 | | 2016 | 6,060 | | 2015 | 6,178 | | 2014 | 6,285 | | 2013 | 6,369 | | 2012 | 6,419 | | 2011 | 6,420 | | 2010 | 6,373 | | 2009 | 6,296 | | 2008 | 6,213 | | 2007 | 6,133 | | 2006 | 6,067 | | 2005 | 6,017 | | 2004 | 5,968 | | 2003 | 5,921 | | 2002 | 5,879 | | 2001 | 5,840 | | 2000 | 5,806 | | 1999 | 5,773 | | 1998 | 5,728 | | 1997 | 5,661 | | 1996 | 5,566 | | 1995 | 5,429 | | 1994 | 5,251 | | 1993 | 5,048 | | 1992 | 4,834 | | 1991 | 4,613 | | 1990 | 4,393 | | 1989 | 4,178 | | 1988 | 3,966 | | 1987 | 3,761 | | 1986 | 3,567 | | 1985 | 3,386 | | 1984 | 3,228 | | 1983 | 3,095 | | 1982 | 2,985 | | 1981 | 2,892 | | 1980 | 2,811 | | 1979 | 2,730 | | 1978 | 2,649 | | 1977 | 2,569 | | 1976 | 2,490 | | 1975 | 2,415 | | 1974 | 2,347 | | 1973 | 2,278 | | 1972 | 2,202 | | 1971 | 2,117 | | 1970 | 2,031 | | 1969 | 1,954 | | 1968 | 1,898 | | 1967 | 1,867 | | 1966 | 1,874 | | 1965 | 1,907 | | 1964 | 1,951 | | 1963 | 1,999 | | 1962 | 2,046 | | 1961 | 2,088 | | 1960 | 2,125 |
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