| Year | Value | | 2022 | 3,541 | | 2021 | 3,601 | | 2020 | 3,677 | | 2019 | 3,759 | | 2018 | 3,841 | | 2017 | 3,924 | | 2016 | 4,001 | | 2015 | 4,065 | | 2014 | 4,109 | | 2013 | 4,136 | | 2012 | 4,149 | | 2011 | 4,155 | | 2010 | 4,159 | | 2009 | 4,188 | | 2008 | 4,224 | | 2007 | 4,226 | | 2006 | 4,207 | | 2005 | 4,176 | | 2004 | 4,138 | | 2003 | 4,108 | | 2002 | 4,095 | | 2001 | 4,100 | | 2000 | 4,115 | | 1999 | 4,149 | | 1998 | 4,201 | | 1997 | 4,251 | | 1996 | 4,318 | | 1995 | 4,400 | | 1994 | 4,408 | | 1993 | 4,353 | | 1992 | 4,248 | | 1991 | 4,028 | | 1990 | 3,776 | | 1989 | 3,486 | | 1988 | 3,269 | | 1987 | 3,057 | | 1986 | 2,914 | | 1985 | 2,770 | | 1984 | 2,629 | | 1983 | 2,543 | | 1982 | 2,467 | | 1981 | 2,370 | | 1980 | 2,299 | | 1979 | 2,174 | | 1978 | 2,121 | | 1977 | 2,031 | | 1976 | 2,065 | | 1975 | 1,998 | | 1974 | 1,882 | | 1973 | 1,758 | | 1972 | 1,604 | | 1971 | 1,505 | | 1970 | 1,364 | | 1969 | 1,319 | | 1968 | 1,241 | | 1967 | 1,113 | | 1966 | 1,068 | | 1965 | 1,033 | | 1964 | 987 | | 1963 | 966 | | 1962 | 854 | | 1961 | 844 | | 1960 | 771 |
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