I’d say I’m hovering around the 60% mark.
I don’t answer calls from numbers I don’t recognise, unless it identifies someone I’m expecting a call from with the “maybe” thing. I don’t use my phone for work (often). I don’t call people to catch up, I’d rather IM. My mother or my best friend call and I ignore them more often than I probably should.
But really I just don’t like talking on the phone that much.
Family/close friends/doctors: 95% (I only don’t if I’m in the toilet, at the doctor, or etc).
Unknown/unsolicited: 0%. If it’s important, leave a message or fuck right off.
Nearly 98% of my calls come from that last group, though, so basically never.