Hovering around 45 and 55%? Has the US ever had a presidential election with turnout as a fraction of eligible voters below 50%? Wasn't even 1996 above 50%?
In any case, I assume that part of the reason for the US, UK, and Canada being low is because of the electoral system, and the fact that both 1) votes in noncompetitive states or districts are "wasted", and 2) FPTP means that voting for longshot parties is pointless, other than for symbolic reasons.
According to
this website, it's happened thrice - 1920, 1924, and 1996.
