How much power can Pixhawk 2.1 I2C ports supply?

Does anyone know how much current it is safe to pull through the 5V power line of the I2C port? I’ve got enough room on the I2C expander for all my sensors, but l don’t know if I’d burn something out using all of them at once–by a very rough estimate it looks like they’d draw about 200mA in total.