I in the 90% category, but some things are (as Hackler noted) experiments and I really don't intend to complete them. Sometimes I'm just spinning -- turning a random piece of wood to pass the time -- and I usually give them away to a passerby or friend unsigned and with a minimum of finish.
Having ample projects really helps. I have four chucks and half a dozen faveplates, allowing me to set things aside, mull over a decision, and come back to complete it.