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| 1968 | 1972a | 1972b | 1973 | 1974 |
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| 1976 | 1977* | 1979a | 1979b* | 1980a |
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| 1980b | 1981 | 1982 | 1983 | 1984 |
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| 1986 | 1988a | 1988b* | 1990 | 1991 |
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| 1992 | 1993 | 1996a | 1996b | 1997 |
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| 1998* | 1999 | 2000* | 2001 | 2003 |
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| 2004a* | 2004b | 2004c | 2007 | 2008 |
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| 2010 | 2013 | 2014* | 2016 | 2017 |
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| 2018a | 2018b | 2019a | 2019b | 2020 |
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| 2021 | ||||