Historically from 707 BC 1935 (2642 yrs total)there were 79 6 disasters caused by migratory locust.Ave.1 disaster=3 yrS. From 1931-1949,disasters occurred almost every ye flooding,droug were e the 3 disasters.Historically from 707 BC – 1935 (2642 yrs total) there were 7 9 6 disasters caused by migratory locust. Ave. 1 disaster= 3 yrs. From 1931-1949, disasters occurred almost every year. Due to this, flooding, droughts and locust were the 3 most common disasters