Average % on a given ITG difficulty number

[Nezeru]

Current percentages from Groovestats (for ITG, obviously):

Expert 9 Average: 99.28%
Expert 10 Average: 98.73%
Expert 11 Average: 98.21%
Expert 12 Average: 93.03% (My artificially low Bloodrush score hurts here.)
Expert 13 Average: 85.56% (VerTex^2 79.54% hurts here =) )

Ranges:
9s: 97.99% to 99.89% (Lipstick Kiss is the low one, Boogie Down the high) (48 tristars, 4 doublestars, 1 star, 53 songs)
10s: 97.53% to 99.59% (One False Move -> Tribal Style) (15 tristars, 14 doublestars, 6 stars, 35 songs)
11s: 96.39% to 99.48% (Clockwork Genesis -> Charlene) (4 tristars, 5 doublestars, 3 stars, 12 songs)
12s: 84.98% to 98.19% (Bloodrush -> VerTex) (1 doublestar, 3 stars, 3 S, 1 S-, 2 A, 10 songs)
13s: 79.54% to 89.72% (Vertex^2 -> Summer ~Speedy Mix~, 87.42 on Pandemonium) (1 S-, 1 A, 1 B+, 3 songs)