| Year | Value | | 2021 | 646,000 | | 2020 | 643,000 | | 2019 | 641,000 | | 2018 | 639,000 | | 2017 | 633,000 | | 2016 | 597,000 | | 2015 | 578,000 | | 2014 | 573,000 | | 2013 | 569,700 | | 2012 | 564,400 | | 2011 | 564,100 | | 2010 | 553,800 | | 2009 | 553,500 | | 2008 | 546,200 | | 2007 | 542,900 | | 2006 | 532,600 | | 2005 | 521,300 | | 2004 | 519,000 | | 2003 | 511,250 | | 2002 | 499,500 | | 2001 | 486,750 | | 2000 | 471,770 | | 1999 | 458,770 | | 1998 | 438,770 | | 1997 | 435,270 | | 1996 | 429,680 | | 1995 | 429,780 | | 1994 | 419,710 | | 1993 | 420,160 | | 1992 | 413,510 | | 1991 | 415,240 | | 1990 | 450,830 | | 1989 | 444,350 | | 1988 | 441,370 | | 1987 | 434,850 | | 1986 | 412,920 | | 1985 | 396,790 | | 1984 | 370,520 | | 1983 | 379,000 | | 1982 | 379,500 | | 1981 | 379,500 | | 1980 | 380,000 | | 1979 | 380,000 | | 1978 | 380,460 | | 1977 | 380,460 | | 1976 | 380,460 | | 1975 | 382,560 | | 1974 | 383,000 | | 1973 | 383,000 | | 1972 | 383,500 | | 1971 | 383,500 | | 1970 | 384,000 | | 1969 | 384,000 | | 1968 | 384,500 | | 1967 | 384,500 | | 1966 | 384,500 | | 1965 | 385,000 | | 1964 | 385,500 | | 1963 | 385,500 | | 1962 | 386,000 | | 1961 | 386,000 |
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