Taunt boost data

Neutral Jump HP - 15 Stun

• 1 taunt = 16 stun
• 1 1/2 taunt = 17 stun
• 2 taunt = 18 stun
• 2 1/2 taunt = 19 stun
• 3 taunt = 20 stun

F+ HP - 12 stun

• 1 taunt = 12 stun
• 2 taunt = 14 stun
• 3 taunt = 16 stun

J.HP/Cl. HP/MK Tornado/etc - 13 Stun  (+5 for Target F+HP link)

• 1 taunt = 14 stun
• 2 taunt =  16 stun
• 3 taunt =  17 stun

Cl. HK/Far MP/etc.  - 11 Stun

• 1 taunt = 12 stun
• 2 taunt = 13 stun
• 3 taunt = 15 stun

Far HP/Forward Throw - 10 Stun

• 1 taunt = 11 stun
• 2 taunt = 12 stun
• 3 taunt = 14 stun

Cl. MP/Hadou Burst/etc. - 9 Stun (+1 for Target Combo)

• 1 taunt = 10 stun
• 2 taunt = 11 stun 
• 3 taunt = 12 stun

EX Dragon Smash/Tackle - 16 stun

• 1 taunt = 17 stun
• 2 taunt = 19 stun
• 3 taunt =  22 stun

Wheel Kick (EX if all 3 hits) - 19 Stun

• 1 taunt = 21 stun
• 2 taunt = 23 stun
• 3 taunt = 26 stun

EX Tornado - 19 Stun

• 1 taunt = 20 stun
• 2 taunt = 21 stun 
• 3 taunt = 24 stun

EX Tackle - 25 Stun

• 1 taunt = 25 stun
• 2 taunt = 27 stun
• 3 taunt = 31 stun

Hyper Tornado - 10 Stun

• 1 taunt = 10 stun
• 2 taunt = 10 stun
• 3 taunt = 12 stun 

Taunt can stack 3 times for a total of 37.5% added to the next hit. Having figured out what I know about taunt oki, it's possible to have "half boosts". How this happens is once you taunt on oki and decide to meaty with a normal, there is still half of the boost left. This puts the boost at 6.25% which will go up to 18.75% should you get an opportunity to taunt again.