Before the Mongol invasion, Chinese dynasties reportedly had approximately 120 million inhabitants; after the conquest had been completed in 1279, the 1300 census reported roughly 60 million people.
This data suggest the outcome of the Mongol invasion and the resulting death that ensued in result to the Mongols conquests. Moreover, this also depicts the number of individuals that were influenced by the Mongol invasion and thus, joining Genghis Khans Empire.