| Year | Value | | 2021 | 311,488 | | 2020 | 356,695 | | 2019 | 1,436,959 | | 2018 | 1,516,628 | | 2017 | 1,375,523 | | 2016 | 1,482,546 | | 2015 | 1,244,491 | | 2014 | 1,409,952 | | 2013 | 1,321,872 | | 2012 | 1,132,424 | | 2011 | 987,798 | | 2010 | 1,010,194 | | 2009 | 274,869 | | 2008 | 283,887 | | 2007 | 277,361 | | 2006 | 262,666 | | 2005 | 239,795 | | 2004 | 222,032 | | 2003 | 198,253 | | 2002 | 189,619 | | 2001 | 193,317 | | 2000 | 235,448 | | 1999 | 293,800 | | 1998 | 552,900 | | 1997 | 555,000 | | 1996 | 585,000 | | 1995 | 552,500 | | 1994 | 519,000 | | 1993 | 333,500 | | 1992 | 440,000 | | 1991 | 456,000 | | 1990 | 451,500 | | 1989 | 509,800 | | 1988 | 750,000 | | 1987 | 746,000 | | 1986 | 727,000 | | 1985 | 894,200 | | 1984 | 689,600 | | 1983 | 952,500 | | 1982 | 890,500 | | 1981 | 801,100 | | 1980 | 635,200 | | 1979 | 546,100 | | 1978 | 308,000 | | 1977 | 282,700 | | 1976 | 155,400 |
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