| Year | Value | | 2021 | 177,992 | | 2020 | 40,884 | | 2019 | 83,882 | | 2018 | 265,136 | | 2017 | 236,000 | | 2016 | 343,592 | | 2015 | 267,208 | | 2014 | 275,760 | | 2013 | 287,208 | | 2012 | 248,027.2 | | 2011 | 171,007.2 | | 2009 | 466,050 | | 2008 | 470,598 | | 2007 | 453,051 | | 2006 | 424,794 | | 2005 | 384,059 | | 2004 | 355,610 | | 2003 | 315,100 | | 2002 | 243,122 | | 2001 | 324,114 | | 2000 | 273,000 | | 1999 | 292,600 | | 1998 | 277,900 | | 1997 | 279,000 | | 1996 | 361,800 | | 1995 | 345,000 | | 1994 | 295,000 | | 1993 | 274,800 | | 1992 | 363,100 | | 1991 | 356,600 | | 1990 | 284,200 | | 1989 | 403,400 | | 1988 | 582,000 | | 1987 | 561,000 | | 1986 | 536,100 | | 1985 | 718,000 | | 1984 | 676,500 | | 1983 | 631,000 | | 1982 | 634,000 | | 1981 | 485,500 | | 1980 | 480,000 | | 1979 | 402,500 | | 1978 | 392,700 | | 1977 | 346,700 | | 1976 | 296,900 | | 1975 | 239,000 | | 1974 | 228,200 | | 1973 | 211,300 | | 1972 | 130,000 | | 1971 | 108,500 | | 1970 | 65,800 |
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