Reported UFO sightings have been declining in the United States for the last few years, according to the statistician tasked with making sense of all the data acquired by the leading civilian UFO investigation group.

The Mutual UFO Network (MUFON) is a non-profit that investigates reports of UFO sightings. The group encourages people who have close encounters to report their sightings on the MUFON site. The organization claims it receives about 7,000 reports per month—but numbers have been on a steady decline since around 2012.

“There definitely has been a fall off of late,” MUFON statistician David C. Korts told Gizmodo. “It hasn’t been a straight line. But in looking at those numbers, it was a peak in 2012 and it’s been a 30 to 40 percent drop from 2012 to 2017.”

This is likely due to people simply not reporting their sightings to MUFON due to an increasing public perception of a MUFON credibility problem, than a real fall off in UFO sightings.   To read more, click here.