Cuba 2004-2006

This looks queer: Rule Cuba 1998 2003 - Oct lastSun 0:00s 0 S Rule Cuba 2000 2006 - Apr Sun>=1 0:00s 1:00 D Rule Cuba 2006 max - Oct lastSun 0:00s 0 S I take the foregoing for something like this: ... 2003 Apr Sun>=1 0:00s 1:00 D 2003 Oct lastSun 0:00s 0 S 2004 Apr Sun>=1 0:00s 1:00 D 2005 Apr Sun>=1 0:00s 1:00 D 2006 Apr Sun>=1 0:00s 1:00 D 2006 Oct lastSun 0:00s 0 S ... but at those Aprils in 2005 and 2006 there is no real shift. Is this right?