For myself, I was going to say about 30%.
But I thought about my view of the probability of me having particular Socionic attributes, the extent to which I identify with the various types, the extent to which familiarity with Socionics may lead to self-monitoring, as well as the level of my confidence that the Socionics system has any empirical validity for any of the parts that are unique to it.
I thus decided on a 10% figure, although I suspect even that is double what it should be.