Straight couples, anyway. I cut up the original figure (from here) so it would display better at this scale. I like the curve for meeting at work, which peaked in the 1990s and has since declined by half. The relationship between dating your office mates and sexual harassment, and the pushback against harassment, is worth pondering. But the bigger picture is that meeting online has replaced meeting through friends and family. I thought meeting in bars was over, but I guess not.
This came up in the context of the Match Group announcing they were going to offer background checks of prospective dates. Which only makes sense in the online dating world, where you have to go out and meet strangers, but still feels very sad and unromantic to me.