About how many people's birthdays do you actively remember?

By “actively remember” I mean doing something to recognize them: sending a message or card, making a phone call, giving a gift, going to lunch, buying a drink, whatever. On time, or (apologetically) soon after.

I don’t mean just thinking silently, “Oh, gosh, it’s Aunt Maggie’s birthday, and I forgot to send a card.”

And for purposes of this question, your own doesn’t count.