https://preview.redd.it/34pyx97gtnuh1.png?width=1428&format=png&auto=webp&s=fd5c1a57a8646033842cec5ebbc4b2feba534b93

Is not meant to be fully accurate, some dates might be mismatched, and also for the most part I rule out interim presidents. However it gives a big picture of the region's trends.