| Year | Value | | 2021 | 137,565 | | 2020 | 149,489 | | 2019 | 414,088 | | 2018 | 455,201 | | 2017 | 633,518 | | 2016 | 567,914 | | 2015 | 497,496 | | 2014 | 407,280 | | 2013 | 344,436 | | 2012 | 235,994 | | 2011 | 393,834 | | 2010 | 412,714 | | 2009 | 564,580 | | 2008 | 586,106 | | 2007 | 574,515 | | 2006 | 545,265 | | 2005 | 498,836 | | 2004 | 461,885 | | 2003 | 413,096 | | 2002 | 518,183 | | 2001 | 419,967 | | 2000 | 393,835 | | 1999 | 347,200 | | 1998 | 368,600 | | 1997 | 384,300 | | 1996 | 373,200 | | 1995 | 314,000 | | 1994 | 297,400 | | 1993 | 289,300 | | 1992 | 239,500 | | 1991 | 242,600 | | 1990 | 242,400 | | 1989 | 179,100 | | 1988 | 227,500 | | 1987 | 223,000 | | 1986 | 195,000 | | 1985 | 185,000 | | 1984 | 113,000 | | 1983 | 65,100 | | 1982 | 65,100 | | 1981 | 15,000 | | 1980 | 15,000 | | 1979 | 12,000 | | 1978 | 12,000 | | 1977 | 12,000 | | 1976 | 12,000 |
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