How much Percentage of Aztecs died from diseases?

It is estimated that diseases brought by Europeans, such as smallpox, measles, and influenza, caused the deaths of around 70-90% of the Aztec population following the Spanish conquest in the early 16th century. The rapid spread of these diseases decimated the population, as the Aztecs had no prior exposure or immunity to such illnesses. This catastrophic decline significantly weakened their society and contributed to the Spanish conquest.