Year | Value | 2022 | 577 | 2021 | 541 | 2020 | 505 | 2019 | 477 | 2018 | 461 | 2017 | 459 | 2016 | 463 | 2015 | 468 | 2014 | 471 | 2013 | 467 | 2012 | 449 | 2011 | 422 | 2010 | 393 | 2009 | 367 | 2008 | 352 | 2007 | 352 | 2006 | 364 | 2005 | 378 | 2004 | 390 | 2003 | 391 | 2002 | 380 | 2001 | 361 | 2000 | 341 | 1999 | 325 | 1998 | 318 | 1997 | 316 | 1996 | 317 | 1995 | 316 | 1994 | 314 | 1993 | 312 | 1992 | 308 | 1991 | 304 | 1990 | 302 | 1989 | 300 | 1988 | 297 | 1987 | 294 | 1986 | 293 | 1985 | 291 | 1984 | 284 | 1983 | 279 | 1982 | 275 | 1981 | 271 | 1980 | 268 | 1979 | 265 | 1978 | 266 | 1977 | 278 | 1976 | 296 | 1975 | 318 | 1974 | 337 | 1973 | 336 | 1972 | 317 | 1971 | 298 | 1970 | 289 | 1969 | 290 | 1968 | 289 | 1967 | 281 | 1966 | 271 | 1965 | 268 | 1964 | 272 | 1963 | 275 | 1962 | 280 | 1961 | 284 | 1960 | 289 |
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