| Year | Value | | 2022 | 2,954 | | 2021 | 2,935 | | 2020 | 2,876 | | 2019 | 2,770 | | 2018 | 2,657 | | 2017 | 2,556 | | 2016 | 2,458 | | 2015 | 2,356 | | 2014 | 2,255 | | 2013 | 2,153 | | 2012 | 2,048 | | 2011 | 1,948 | | 2010 | 1,858 | | 2009 | 1,777 | | 2008 | 1,716 | | 2007 | 1,675 | | 2006 | 1,648 | | 2005 | 1,629 | | 2004 | 1,618 | | 2003 | 1,603 | | 2002 | 1,581 | | 2001 | 1,561 | | 2000 | 1,551 | | 1999 | 1,547 | | 1998 | 1,546 | | 1997 | 1,547 | | 1996 | 1,552 | | 1995 | 1,551 | | 1994 | 1,546 | | 1993 | 1,534 | | 1992 | 1,516 | | 1991 | 1,495 | | 1990 | 1,474 | | 1989 | 1,452 | | 1988 | 1,432 | | 1987 | 1,411 | | 1986 | 1,388 | | 1985 | 1,360 | | 1984 | 1,330 | | 1983 | 1,296 | | 1982 | 1,258 | | 1981 | 1,217 | | 1980 | 1,176 | | 1979 | 1,136 | | 1978 | 1,100 | | 1977 | 1,069 | | 1976 | 1,042 | | 1975 | 1,014 | | 1974 | 988 | | 1973 | 963 | | 1972 | 934 | | 1971 | 907 | | 1970 | 881 | | 1969 | 855 | | 1968 | 829 | | 1967 | 804 | | 1966 | 780 | | 1965 | 759 | | 1964 | 739 | | 1963 | 719 | | 1962 | 700 | | 1961 | 680 | | 1960 | 657 |
|