Simple, really.
This is WM 25, but what is it for you? How many have you watched, and if you remember what they are, list them.
For me, I've seen:
WM 13, WM 14, WM 16, WM 20, 21, 22, 23, 24, and this one coming up.
So, this will be WM 9 for me.
How about you?