| Year | Value | | 2021 | 277,881.434 | | 2020 | 292,931 | | 2019 | 1,221,786.6751241 | | 2018 | 1,191,383.0826596 | | 2017 | 1,485,752 | | 2016 | 1,409,704 | | 2015 | 1,313,533 | | 2014 | 1,024,693.8447786 | | 2009 | 85,448 | | 2008 | 91,096 | | 2007 | 92,483 | | 2006 | 93,417 | | 2005 | 81,945 | | 2004 | 75,875 | | 2003 | 60,218 | | 2002 | 57,902 | | 2001 | 56,216 | | 2000 | 315,108 | | 1999 | 261,100 | | 1998 | 247,200 | | 1997 | 188,900 | | 1996 | 206,900 | | 1995 | 158,600 | | 1994 | 38,500 | | 1993 | 9,400 | | 1992 | 9,400 | | 1991 | 9,400 | | 1990 | 9,400 | | 1989 | 8,400 | | 1988 | 8,400 | | 1987 | 8,400 | | 1986 | 65,000 | | 1985 | 60,000 | | 1984 | 40,000 | | 1983 | 38,000 | | 1982 | 34,000 | | 1981 | 33,800 | | 1980 | 27,000 | | 1979 | 25,000 | | 1978 | 20,000 | | 1977 | 13,000 | | 1976 | 10,000 | | 1975 | 7,000 |
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