35% of the world’s population drivers on the left side of the road
Back in the early days when the knights were riding their horses, everyone was using the left side, as it was more practicable. Everything changed as people started to driving carriages and it become more convenient to sit on the right side. It took a while to get introduced in most of the countries, but 35% of the world population is still driving on the left side and that probably isn’t going to change anytime soon.