Why is the toilet paper almost always mounted on the wall to the left of the toilet?

Thinking of my house, the houses I’ve lived in, and the public toilets I tend to visit, in every instance the bathroom is configured so that the toilet is against a wall standing on the left so that the toilet paper can be mounted there. Why?

Sure, we’re a right handed society, but are we multi-tasking in the bathroom? Wiping with the right hand while simultaneously pulling out another bit of paper with our left?

Sure, it’s a frivolous question, but one I think of a lot. I have mild scoliosis and it’s more difficult for me to turn to the left than the right. In my bathroom I’ve taken to leaving a roll of toilet paper on the floor right of the toilet so I can pick it up and use it easily. If bathroom stalls are very narrow, I have trouble getting toilet paper from the left.

Something few of us have given thought to?