| Year | Value | | 2022 | 2,541 | | 2021 | 2,513 | | 2020 | 2,466 | | 2019 | 2,362 | | 2018 | 2,205 | | 2017 | 2,023 | | 2016 | 1,841 | | 2015 | 1,687 | | 2014 | 1,573 | | 2013 | 1,500 | | 2012 | 1,460 | | 2011 | 1,438 | | 2010 | 1,412 | | 2009 | 1,388 | | 2008 | 1,359 | | 2007 | 1,317 | | 2006 | 1,273 | | 2005 | 1,234 | | 2004 | 1,210 | | 2003 | 1,207 | | 2002 | 1,219 | | 2001 | 1,236 | | 2000 | 1,253 | | 1999 | 1,259 | | 1998 | 1,241 | | 1997 | 1,190 | | 1996 | 1,107 | | 1995 | 1,006 | | 1994 | 902 | | 1993 | 809 | | 1992 | 733 | | 1991 | 674 | | 1990 | 625 | | 1989 | 587 | | 1988 | 567 | | 1987 | 559 | | 1986 | 550 | | 1985 | 537 | | 1984 | 521 | | 1983 | 498 | | 1982 | 465 | | 1981 | 432 | | 1980 | 392 | | 1979 | 346 | | 1978 | 313 | | 1977 | 289 | | 1976 | 265 | | 1975 | 242 | | 1974 | 222 | | 1973 | 201 | | 1972 | 183 | | 1971 | 167 | | 1970 | 159 | | 1969 | 163 | | 1968 | 172 | | 1967 | 178 | | 1966 | 182 | | 1965 | 181 | | 1964 | 174 | | 1963 | 165 | | 1962 | 154 | | 1961 | 141 | | 1960 | 127 |
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