| Year | Value | | 2023 | 7,034 | | 2022 | 6,948 | | 2021 | 6,864 | | 2020 | 6,746 | | 2019 | 6,527 | | 2018 | 6,241 | | 2017 | 5,962 | | 2016 | 5,702 | | 2015 | 5,459 | | 2014 | 5,237 | | 2013 | 5,031 | | 2012 | 4,836 | | 2011 | 4,650 | | 2010 | 4,474 | | 2009 | 4,305 | | 2008 | 4,149 | | 2007 | 4,011 | | 2006 | 3,882 | | 2005 | 3,759 | | 2004 | 3,639 | | 2003 | 3,515 | | 2002 | 3,384 | | 2001 | 3,251 | | 2000 | 3,121 | | 1999 | 2,999 | | 1998 | 2,883 | | 1997 | 2,775 | | 1996 | 2,677 | | 1995 | 2,592 | | 1994 | 2,543 | | 1993 | 2,471 | | 1992 | 2,496 | | 1991 | 2,496 | | 1990 | 2,274 | | 1989 | 2,036 | | 1988 | 1,870 | | 1987 | 1,739 | | 1986 | 1,618 | | 1985 | 1,517 | | 1984 | 1,435 | | 1983 | 1,369 | | 1982 | 1,313 | | 1981 | 1,253 | | 1980 | 1,181 | | 1979 | 1,096 | | 1978 | 1,000 | | 1977 | 901 | | 1976 | 811 | | 1975 | 732 | | 1974 | 666 |
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