What is the deadliest mountain in the world?

Could you elaborate on the criteria used to determine the deadliest mountain in the world? Are we considering factors such as the number of fatalities, the difficulty of the climb, or the environmental hazards posed by the mountain? Also, is there a specific mountain that consistently tops the list as the most deadly, or does this title vary depending on the year and the circumstances surrounding climbing attempts? Lastly, are there any measures being taken to improve safety and reduce the number of fatalities on these mountains?