Answer:
1950 to 2000
Step-by-step explanation:
AS you can see in the graph the average temperatur for the period of time from 1950 to 2000 is at least 120 and has the highest peak reaching almost the 200, and has the highest coldest temperature reaching the 110, so the average would be above the 130, that´s why that period of time wtinessed the greatest increase in average global temperature.