| Year | Value | | 2022 | 3,434 | | 2021 | 3,413 | | 2020 | 3,333 | | 2019 | 3,268 | | 2018 | 3,190 | | 2017 | 3,119 | | 2016 | 3,088 | | 2015 | 3,068 | | 2014 | 3,041 | | 2013 | 3,035 | | 2012 | 3,055 | | 2011 | 3,083 | | 2010 | 3,125 | | 2009 | 3,174 | | 2008 | 3,205 | | 2007 | 3,217 | | 2006 | 3,204 | | 2005 | 3,146 | | 2004 | 3,041 | | 2003 | 2,911 | | 2002 | 2,781 | | 2001 | 2,676 | | 2000 | 2,604 | | 1999 | 2,546 | | 1998 | 2,494 | | 1997 | 2,439 | | 1996 | 2,402 | | 1995 | 2,389 | | 1994 | 2,382 | | 1993 | 2,388 | | 1992 | 2,394 | | 1991 | 2,387 | | 1990 | 2,362 | | 1989 | 2,324 | | 1988 | 2,290 | | 1987 | 2,274 | | 1986 | 2,288 | | 1985 | 2,316 | | 1984 | 2,330 | | 1983 | 2,320 | | 1982 | 2,304 | | 1981 | 2,304 | | 1980 | 2,315 | | 1979 | 2,329 | | 1978 | 2,343 | | 1977 | 2,342 | | 1976 | 2,314 | | 1975 | 2,271 | | 1974 | 2,234 | | 1973 | 2,209 | | 1972 | 2,192 | | 1971 | 2,172 | | 1970 | 2,150 | | 1969 | 2,124 | | 1968 | 2,092 | | 1967 | 2,056 | | 1966 | 2,013 | | 1965 | 1,960 | | 1964 | 1,902 | | 1963 | 1,841 | | 1962 | 1,780 | | 1961 | 1,716 | | 1960 | 1,652 |
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