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| 1979 | 1984** | 1988a | 1988b | 1991 |
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| 1994 | 1995** | 1998 | 1999a | 1999b |
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| 1999c | 2001a | 2001b** | 2001c** | 2001d** |
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| 2004a | 2007a | 2007b | 2008 | 2009 |
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| 2010 | ||||