If I understand your question correctly, you're basically asking about how often people remember lucid dreams.
I know for certain that I have more lucid dreams than I realize I have. Which, of course, is ironic, because if I know I have them, how could I not realize I had them? 
Well, if you read LaBerge's "Exploring the World Of Lucid Dreaming," he discusses his concept of "shadow memories."
Occasionally, (in fact, quite often now) I have lucid dreams that I don't remember (due to my own laziness resulting in an extreme drop in dream recall) and I randomly remember bits of these shadow memories throughout the day.
Someone might say a word that triggers a bit of one of my dream memories from as long ago as a few days or even a week, and I'll slowly realize, "oh shit, I was lucid when that happened." It's a weird occurance, but it happens a lot!
-Rainman
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