Query: What is the  estimation of deer slaughtered in Charles Town from 1739 to 1761?
Context: Between 1699 and 1715, colonists exported an average of 54,000 deer skins annually to Europe through Charles Town. Between 1739 and 1761, the height of the deerskin trade era, an estimated 500,000 to 1,250,000 deer were slaughtered. During the same period, Charles Town records show an export of 5,239,350 pounds of deer skins.