| Year | Value | | 2022 | 3,517 | | 2021 | 3,433 | | 2020 | 3,364 | | 2019 | 3,295 | | 2018 | 3,232 | | 2017 | 3,161 | | 2016 | 3,095 | | 2015 | 3,046 | | 2014 | 2,995 | | 2013 | 2,928 | | 2012 | 2,849 | | 2011 | 2,766 | | 2010 | 2,682 | | 2009 | 2,599 | | 2008 | 2,524 | | 2007 | 2,432 | | 2006 | 2,319 | | 2005 | 2,216 | | 2004 | 2,126 | | 2003 | 2,045 | | 2002 | 1,981 | | 2001 | 1,932 | | 2000 | 1,885 | | 1999 | 1,842 | | 1998 | 1,800 | | 1997 | 1,755 | | 1996 | 1,738 | | 1995 | 1,760 | | 1994 | 1,792 | | 1993 | 1,823 | | 1992 | 1,849 | | 1991 | 1,866 | | 1990 | 1,867 | | 1989 | 1,850 | | 1988 | 1,820 | | 1987 | 1,783 | | 1986 | 1,684 | | 1985 | 1,553 | | 1984 | 1,465 | | 1983 | 1,401 | | 1982 | 1,347 | | 1981 | 1,299 | | 1980 | 1,258 | | 1979 | 1,225 | | 1978 | 1,201 | | 1977 | 1,188 | | 1976 | 1,188 | | 1975 | 1,185 | | 1974 | 1,169 | | 1973 | 1,151 | | 1972 | 1,133 | | 1971 | 1,113 | | 1970 | 1,095 | | 1969 | 1,088 | | 1968 | 1,088 | | 1967 | 1,097 | | 1966 | 1,059 | | 1965 | 1,006 | | 1964 | 1,001 | | 1963 | 1,013 | | 1962 | 1,027 | | 1961 | 1,042 | | 1960 | 1,053 |
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