| Year | Value | | 2022 | 5,872 | | 2021 | 5,429 | | 2020 | 5,174 | | 2019 | 5,043 | | 2018 | 4,975 | | 2017 | 4,908 | | 2016 | 4,833 | | 2015 | 4,800 | | 2014 | 4,740 | | 2013 | 4,618 | | 2012 | 4,534 | | 2011 | 4,530 | | 2010 | 4,554 | | 2009 | 4,579 | | 2008 | 4,590 | | 2007 | 4,574 | | 2006 | 4,534 | | 2005 | 4,446 | | 2004 | 4,327 | | 2003 | 4,197 | | 2002 | 4,040 | | 2001 | 3,894 | | 2000 | 3,775 | | 1999 | 3,626 | | 1998 | 3,452 | | 1997 | 3,305 | | 1996 | 3,141 | | 1995 | 2,968 | | 1994 | 2,840 | | 1993 | 2,728 | | 1992 | 2,610 | | 1991 | 2,529 | | 1990 | 2,489 | | 1989 | 2,463 | | 1988 | 2,466 | | 1987 | 2,485 | | 1986 | 2,487 | | 1985 | 2,466 | | 1984 | 2,429 | | 1983 | 2,370 | | 1982 | 2,293 | | 1981 | 2,206 | | 1980 | 2,100 | | 1979 | 1,997 | | 1978 | 1,922 | | 1977 | 1,863 | | 1976 | 1,803 | | 1975 | 1,725 | | 1974 | 1,616 | | 1973 | 1,481 | | 1972 | 1,331 | | 1971 | 1,188 | | 1970 | 1,115 | | 1969 | 1,119 | | 1968 | 1,159 | | 1967 | 1,199 | | 1966 | 1,223 | | 1965 | 1,217 | | 1964 | 1,203 | | 1963 | 1,187 | | 1962 | 1,154 | | 1961 | 1,116 | | 1960 | 1,068 |
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