| Peaks/year |
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| 0 | 2007 | 2011 | 2015 |
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| 01 | years | 2004 | 2012 | 2013 | 2014 | 2018 |
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| Peak months | 5 | 6 | 6 | 9 | 6 |
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| 02 | years | 1999 | 2001 | 2005 | 2008 | 2009 | 2017 |
| Peak months | 6, 9 | 8, 9 | 7, 8 | 5, 6 | 6, 8 | 5, 6 | |
| 03 | years | 1998 | 2000 | 2003 | 2006 | 2016 |
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| Peak months | 5, 6, 7 | 5, 6, 9 | 5, 6, 7 | 6, 9, 10 | 6, 9, 10 |
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| 04/6 | years | 1998 | 1999 |
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| Peak months | 4, 5, 6, 7, 8, 9 | 5, 7, 8, 9 |
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