Power supplies by brand:

Fortron / FSP Group - 0.49% (0.99%)
BeQuiet - 0.61% (1.15%)
Antec - 1.33% (1.23%)
Cooler Master - 1.52% (0.98%)
Seasonic - 1.6% (2.36%)
Thermaltake - 1.87% (1.98%)
Akasa - 1.92% (N/A)
Corsair - 1.96% (2.18%)
Cougar - 2.41% (N/A)

Power supplies by model:

Cougar ST-350 - 4.86%
Corsair CX600 V2 - 4.76%
Thermaltake SP-550MPCBEU - 4.46%
Corsair CX500 V2 - 4.19%
Cooler Master Silent Pro M2 850 - 4.13%