| Year | Value | | 2022 | 2,504 | | 2021 | 2,246 | | 2020 | 2,301 | | 2019 | 2,442 | | 2018 | 2,449 | | 2017 | 2,416 | | 2016 | 2,169 | | 2015 | 1,935 | | 2014 | 2,047 | | 2013 | 2,112 | | 2012 | 1,845 | | 2011 | 1,445 | | 2010 | 1,310 | | 2009 | 1,499 | | 2008 | 1,515 | | 2007 | 1,257 | | 2006 | 1,004 | | 2005 | 814 | | 2004 | 706 | | 2003 | 677 | | 2002 | 676 | | 2001 | 679 | | 2000 | 676 | | 1999 | 656 | | 1998 | 620 | | 1997 | 579 | | 1996 | 552 | | 1995 | 534 | | 1994 | 514 | | 1993 | 488 | | 1992 | 457 | | 1991 | 423 | | 1990 | 389 | | 1989 | 363 | | 1988 | 342 | | 1987 | 322 | | 1986 | 309 | | 1985 | 317 | | 1984 | 341 | | 1983 | 358 | | 1982 | 366 | | 1981 | 366 | | 1980 | 360 | | 1979 | 354 | | 1978 | 346 | | 1977 | 336 | | 1976 | 324 | | 1975 | 313 | | 1974 | 302 | | 1973 | 293 | | 1972 | 284 | | 1971 | 276 | | 1970 | 271 | | 1969 | 257 | | 1968 | 232 | | 1967 | 208 | | 1966 | 186 | | 1965 | 168 | | 1964 | 150 | | 1963 | 134 | | 1962 | 120 | | 1961 | 106 | | 1960 | 95 |
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