From my experience, there are only a few practical states that I can discern in dreaming.
non-lucid. I don't realize I am dreaming.
semi-lucid. I realize I am dreaming, but I remain distracted and do not take advantage of the situation, or fall into an automatic behavior without deliberation (yaaaaayyyy! I can fly! :bslap:). Basically, no self-control.
lucid. I know I am dreaming, and I have some modicum of self-control. I don't wake up, and I don't lose lucidity.
Then, there is the matter of self-control, which I usually rate based on how long I can keep myself in the lucid state.
I think percentages are meaningless, really, to the average lucid dreamer. It boils down to how long you can keep up a true lucid state, and what you manage to do in the dream.