This subject came up in conversation the other day, discussing PvP. Here, via Castle, are the official numbers on Toggle Drop powers under I7 (which reduces them some):
Inherent: Brawl: 5% for 1 Toggle
Blaster: Devices: Trip Mine: 5% for 1 Toggle
Blaster: Devices: Time Bomb: 19% for 1 Toggle
Blaster: Electrical Manipulation: Charged Brawl: 5% for 1 Toggle
Blaster: Electrical Manipulation: Havok Punch: 22% for 1 Toggle
Blaster: Energy Manipulation: Bone Smasher: 22% for 1 Toggle
Blaster: Energy Manipulation: Energy Punch: 5% for 1 Toggle
Blaster: Fire Manipulation: Fire Sword: 5% for 1 Toggle
Blaster: Fire Manipulation: Fire Sword Circle: 22% for 1 Toggle
Blaster: Ice Manipulation: Frozen Fists: 5% for 1 Toggle
Blaster: Ice Manipulation: Ice Sword: 22% for 1 Toggle
Defender Force Field: Force Bolt: 8% and 2% for 1 Toggle; 0.16% chance of 2 Toggles
Controller Force Field: Force Bolt: 5% for 1 Toggle
Mastermind Force Field: Force Bolt: 5% for 1 Toggle
Defender Force Field: Repulsion Bomb: 27% and 5% for 1 Toggle; 1.35% chance of 2 Toggles
Controller Force Field: Repulsion Bomb: 19% for 1 Toggle
Mastermind Force Field: Repulsion Bomb:19% for 1 Toggle
Defender Force Field: Repulsion Field: 5% and 2% chance for 1 Toggle per 1/2 second; 0.1% chance for 2 Toggles per 1/2 second
Controller Force Field: Repulsion Field: 3% for 1 Toggle per 1/2 second
Mastermind Force Field: Repulsion Field: 3% for 1 Toggle per 1/2 second
Defender: Kinetics: Repel: 5% and 2% chance for 1 Toggle per 1/2 second; 0.1% chance for 2 Toggles per 1/2 second
Controller: Kinetics: Repel: 3% for 1 Toggle per 1/2 second
Corruptor: Kinetics: Repel: 3% for 1 Toggle per 1/2 second
Peacebringer: White Dwarf Strike: 5% for 1 Toggle Defender
Storm Summoning: Lightning Storm: 20% and 4% for 1 Toggle; 0.8% chance of 2 Toggles
Controller Storm Summoning: Lightning Storm: 17% for 1 Toggle
Defender Storm Summoning: Thunder Clap: 12% and 2% for 1 Toggle; 0.4% chance of 2 Toggles
Controller Storm Summoning: Thunder Clap: 8% for 1 Toggle
Warshade: Black Dwarf Strike: 5% for 1 Toggle
Stalker: Assassin’s Claw: 22% and 4% for 1 Toggle; 0.88% chance for 2 Toggles
Stalker: Assassin’s Strike: 22% and 4% for 1 Toggle; 0.88% chance for 2 Toggles
Stalker: Assassin’s Blow: 22% and 4% for 1 Toggle; 0.88% chance for 2 Toggles
Stalker: Assassin’s Blade: 22% and 4% for 1 Toggle; 0.88% chance for 2 Toggles
Stalker: Assassin’s Impaler: 22% and 4% for 1 Toggle; 0.88% chance for 2 Toggles
Stalker: Assassin’s Eclipse: 22% and 4% for 1 Toggle; 0.88% chance for 2 Toggles
Dominator: Bone Smasher: 5% for 1 Toggle
Dominator: Total Focus: 64% for 1 Toggle
Dominator: Incinerate: 5% for 1 Toggle
Dominator: Blaze: 64% for 1 Toggle
Dominator: Ice Sword: 5% for 1 Toggle
Dominator: Greater Ice Sword: 64% for 1 Toggle
Dominator: Mind Probe: 5% for 1 Toggle
Dominator: Psychic Shockwave: 64% for 1 Toggle
Dominator: Skewer: 5% for 1 Toggle
Dominator: Ripper: 64% for 1 Toggle
Mastermind: Assault Bot Smash: 5% for 1 Toggle
Corruptor: Traps: Time Bomb: 19% for 1 Toggle
Corruptor: Traps: Trip Mine: 75% and 37% for 1 Toggle; 27.75% chance for 2 Toggles
Mastermind: Traps: Trip Mine: 75% and 37% for 1 Toggle; 27.75% chance for 2 Toggles
And now you know.