| Year | Value | | 2024 | 700 | | 2023 | 692 | | 2022 | 686 | | 2021 | 676 | | 2020 | 663 | | 2019 | 651 | | 2018 | 639 | | 2017 | 626 | | 2016 | 614 | | 2015 | 600 | | 2014 | 581 | | 2013 | 565 | | 2012 | 558 | | 2011 | 552 | | 2010 | 537 | | 2009 | 517 | | 2008 | 493 | | 2007 | 466 | | 2006 | 438 | | 2005 | 412 | | 2004 | 391 | | 2003 | 375 | | 2002 | 359 | | 2001 | 341 | | 2000 | 321 | | 1999 | 302 | | 1998 | 285 | | 1997 | 272 | | 1996 | 260 | | 1995 | 249 | | 1994 | 238 | | 1993 | 226 | | 1992 | 214 | | 1991 | 203 | | 1990 | 197 | | 1989 | 189 | | 1988 | 182 | | 1987 | 183 | | 1986 | 189 | | 1985 | 191 | | 1984 | 194 | | 1983 | 196 | | 1982 | 198 | | 1981 | 202 | | 1980 | 200 | | 1979 | 197 | | 1978 | 196 | | 1977 | 194 | | 1976 | 192 | | 1975 | 190 |
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