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| Year | Jan-Feb | Mar-Apr | May-Jun | Jul-Aug | Sep-Oct | Nov-Dec | Volume |
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| 2013 | 
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| 20 | ||||
| 2012 | 
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| 19 |
| 2011 | 
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| 18 |
| 2010 | 
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| 17 |
| 2009 | 
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| 16 |
| 2008 | 
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| 15 |
| 2007 | 
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| 14 |
| 2006 | 
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| 13 |
| 2005 | 
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| 12 |
| 2004 | 
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| 11 |
| 2003 | 
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| 10 |
| 2002 | 
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| 9 |
| 2001 | 
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| 8 |
| 2000 | 
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| 7 | |||
| 1999 | 
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| 6 |
| 1998 | 
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| 5 | |
| 1997 | 
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| 4 | ||
| 1996 | 
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| 3 |