Here's few intersting stats when going allin is mandatory.
How strong your poket cards are vs. many players?

AA
vs 2: 85%
vs 3: 74%
vs 4: 64%
vs 6: 49%

KK
vs 2: 82%
vs 3: 69%
vs 4: 59%
vs 6: 44%

QQ
vs 2: 80%
vs 3: 65%
vs 4: 54%
vs 6: 39%

JJ
vs 2: 77%
vs 3: 62%
vs 4: 50%
vs 6: 35%

TT
vs 2: 75%
vs 3: 58%
vs 4: 46%
vs 6: 31%

99
vs 2: 72%
vs 3: 54%
vs 4: 42%
vs 6: 28%

88
vs 2: 69%
vs 3: 50%
vs 4: 38%
vs 6: 25%

77
vs 2: 66%
vs 3: 47%
vs 4: 35%
vs 6: 23%

AK(off)
vs 2: 65%
vs 3: 49%
vs 4: 41%
vs 6: 30%

AQ(off)
vs 2: 64%
vs 3: 48%
vs 4: 38%
vs 6: 27%