

I suppose you could come up with a scenario where the number is uneven (i.e., odd): suppose A and B marry in Year 1. Next, suppose B dies suddenly in Year 1 (after the marriage has been consummated). Next, suppose A marries C in Year 1 (after a short but productive period of grieving). Suppose no one else gets married in Year 1.
As I count things - and I don't want to start any trouble - we have 2 marriages, but 3 people who got married, in Year 1.