This year's gubernatorial election in Okinawa Prefecture is the 13th since reversion to Japan in 1972 and the 14th since the public election of the chief executive of the Ryukyu Islands, the position's name during the U.S. administration of the islands.
If one goes back to that election in 1968, then 2018 marks the 50th anniversary of Okinawa voters being able to directly chose their governor.
How have they voted during these five decades?