With a population of 1.8 million as of 2010, Iztapalapa is the most populous borough of Mexico City, and it is also the most populous municipality in the country. Over 90% of its territory is urbanized. The borough transitioned from a rural area with some farms and canals as late as the 1970s, to an area with the only green areas in parks and almost all of its people employed in commerce, services and industry. This is the result of a large influx of people into the borough starting from the 1970s and which still continues. The area has a high level of socioeconomic marginalization, with a significant number of people lacking sufficient access to clean potable water. Crime is also a major problem, with much of it related to drug trafficking and poverty. However, the borough is home of one of Mexico City's major cultural events, the annual Passion Play in which 450 borough residents participate and about 2 million attend as spectators.