Task: Question Answering
Input (English): Passage: As of 2010, the population is 4,796,580, the eighth most populous state in Mexico. The 20th century saw large population growth in Chiapas. From fewer than one million inhabitants in 1940, the state had about two million in 1980, and over 4 million in 2005. Overcrowded land in the highlands was relieved when the rainforest to the east was subject to land reform. Cattle ranchers, loggers, and subsistence farmers migrated to the rain forest area. The population of the Lacandon was only one thousand people in 1950, but by the mid-1990s this had increased to 200 thousand. As of 2010, 78% lives in urban communities with 22% in rural communities. While birthrates are still high in the state, they have come down in recent decades from 7.4 per woman in 1950. However, these rates still mean significant population growth in raw numbers. About half of the states population is under age 20, with an average age of 19. In 2005, there were 924,967 households, 81% headed by men and the rest by women. Most households were nuclear families (70.7%) with 22.1% consisting of extended families. 
Question: How many people did the population increase between 1980 and 2005? 
Answer type: Number 
Output (English): 2000000.