This is a rough estimate from my experience. Assuming a sample of 20 people:
1 to 3 will have cleared t9 and claim to easy.
4 to 6 will be between t6 and t9 and claim fair.
9 or so people will be at titan ex/t5 unable to clear, claim to hard.
Any one else is has not progressed far enough, or has payed for a clear, so omitted from estimate.