Some more detail if you're interested.

It goes back to 1941 because that's the first city I could find that implemented ranked choice voting in the US that has kept it till present: Cambridge Massachusetts. The big jump a bit before 2020 was when New York City adopted Ranked Choice voting.

I'd like to add some detail to show which states it was implemented in but couldn't figure it out in the time I had.

I apologize that it's a bit ugly, the Google Sheets timeline chart is not very customizeable and my Gimp skills are only OK. However, I have heard that Ranked Choice is growing in popularity as a voting method in the US so I wanted to see the trend for myself but couldn't find anything graphing this trend, so I made it.