- July 2003 : 14
- August 2003 : 14 (→)
- October 2003 : 14 (→)
- December 2003 : 14 (→)
- March 2004 : 14 (→)
- June 2004 : 13 (↑)
- August 2004 : 13 (→)
- December 2004 : 13 (→)
- March 2005 : 12 (↑)
- June 2005 : 11 (↑)
- September 2005 : 11 (→)
- December 2005 : 11 (→)
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- March 2006 : 11 (→)
- May 2006 : 13 (↓)
- September 2006 : 13 (→)
- December 2006 : 10 (↑)
- March 2007 : 9 (↑)
- June 2007 : 10 (↓)
- October 2007 : 11 (↓)
- December 2007 : 11 (→)
- March 2008 : 10 (↑)
- June 2008 : 10 (→)
- September 2008 : 9 (↑)
- December 2008 : 9 (→)
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- March 2009 : 7 (↑)
- June 2009 : 7 (→)
- September 2009 : 6 (↑)
- December 2009 : 6 (→)
- March 2010 : 5 (↑)
- May 2010 : 5 (→)
- August 2010 : 5 (→)
- November 2010 : 5 (→)
- March 2011 : 4 (↑)
- July 2011 : 4 (→)
- September 2011 : 4 (→)
- December 2011 : 3 (↑)
- March 2012 : 3 (→)
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