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It is estimated to be 15000 births per hour in the United States.
One cubic foot per minute = 7.481 US gallons per minute.
880.57 US gallons per minute
1000 litres per hour equates to 3.667 Imperial gallons per minute or 4.4 US gallons per minute.
In the US, the incidence of fraternal (dyzygotic) twins is 32 in 1000 live births.