Unless they had some serious funds in order to create a valid test pool with all neccesary safeguards to counteract any possibly misinformation, I wouldn't trust numbers like that. It is more likely those numbers came from an internet IQ test where people had to type in their MBTI in one of the fields. Which creates a whole array of factors that should be considered as well. What was the situation the person taking the test found himself in? Did he take the test at 3am at night after a long day of work being sleep deprived or was he refreshed. Did he take the test seriously or just went through it half cocked? Was he even typed correctly?
Unless a site like that discloses its sources, I wouldn't put much stock at all in its results.