American presidents: an astrological anomaly!

I spent an idle hour looking up the astrological birth-signs of all American presidents from Washington onwards, and discovered a very odd statistical quirk.
   Every star-sign could boast at least two presidents, and none had more than five, which seems a fairly even distribution; but the result for Aquarius was very strange. Of the five presidents born under Aquarius, no fewer than four died while in office. Two, William Harrison and Franklin Roosevelt, died natural deaths, but Lincoln and McKinley were assassinated; thereby altogether making up no less than 50% of all the presidents who died prematurely. The only Aquarian president to serve out his full term was Ronald Reagan - and he narrowly survived an assassination attempt less than three months after taking office! On March 30th 1981 he was shot in the chest by John Hinckley jnr. and was fortunate to survive (Hinckley was adjudged to be insane).
    What would an astrologer make of this? That Reagan's famous good luck enabled him to defeat the malignant hand of fate? Certainly the figures suggest that Americans could be in for an exciting time if they ever again elect an Aquarian as president!