Manipur became a full fledged State on 21st January 1972. It has two distinct regions, the hill tracts comprising 5 districts, and the plains with 4 districts. Agriculture is the largest source of livelihood of the people. More than 54,100 hectares of land are under irrigation and forests cover about three-fourths of the area. The State has a large tribal population. Besides agricultural crops like rice and maize, rare flowers such as orchids are also grown. Major industries in the State are spinning mills, electronics and cement. Winters in the State are cold, summers mild, and the average annual rainfall is 252 cm.