What the hell, is this test meant to flatter us? My type says 1% also. By my count that makes 4 of the 16 personality types that each comprise only 1% of the population.
I talked to friends about this a long time ago, one a psychologist and the other an anthropologist. They both were of the opinion that these tests could be used as tools to determine a personality type like intended, but there's nothing that suggests that ONLY these personality types exist. The reason it seems hokey (like astrology) is because it kinda works. But I had this conversation a long time ago and can't remember the details.
Incidentally both times I took the test (then and today), I got the same personality type INFP - "Healer". The description fits me fairly well, I think.