1976-1982[]
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1981 (5th anniversary)[]
1982-1985[]
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1985-1987[]
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1986 (10th anniversary)[]
1987-1995[]
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1991 (15th anniversary)[]
1995-2003[]
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1996 (20th anniversary)[]
2001 (25th anniversary)[]
2003-2008[]
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2006 (30th anniversary)[]
2008-2017[]
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2011 (35th anniversary)[]
2016 (40th anniversary)[]
2017-present[]
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