| Year | Value | | 2022 | 2,937 | | 2021 | 3,045 | | 2020 | 3,161 | | 2019 | 3,264 | | 2018 | 3,306 | | 2017 | 3,277 | | 2016 | 3,193 | | 2015 | 3,086 | | 2014 | 2,993 | | 2013 | 2,935 | | 2012 | 2,912 | | 2011 | 2,923 | | 2010 | 2,975 | | 2009 | 3,035 | | 2008 | 3,042 | | 2007 | 3,007 | | 2006 | 2,970 | | 2005 | 2,954 | | 2004 | 2,968 | | 2003 | 3,020 | | 2002 | 3,119 | | 2001 | 3,242 | | 2000 | 3,334 | | 1999 | 3,327 | | 1998 | 3,228 | | 1997 | 3,034 | | 1996 | 2,770 | | 1995 | 2,533 | | 1994 | 2,411 | | 1993 | 2,392 | | 1992 | 2,423 | | 1991 | 2,650 | | 1990 | 2,984 | | 1989 | 3,175 | | 1988 | 3,221 | | 1987 | 3,187 | | 1986 | 3,141 | | 1985 | 3,108 | | 1984 | 3,092 | | 1983 | 3,075 | | 1982 | 3,024 | | 1981 | 2,949 | | 1980 | 2,882 | | 1979 | 2,805 | | 1978 | 2,708 | | 1977 | 2,612 | | 1976 | 2,520 | | 1975 | 2,440 | | 1974 | 2,380 | | 1973 | 2,330 | | 1972 | 2,293 | | 1971 | 2,288 | | 1970 | 2,282 | | 1969 | 2,241 | | 1968 | 2,181 | | 1967 | 2,119 | | 1966 | 2,088 | | 1965 | 2,083 | | 1964 | 2,086 | | 1963 | 2,100 | | 1962 | 2,113 | | 1961 | 2,105 | | 1960 | 2,074 |
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