Description

Source for data: https://www.ufocasebook.com/

As pictured above:

* Saucer and disc-type UFOs - most reported between 1940 and 1960.
* Cigar and cylinder-type UFOs - most reported between 1950 and 1980.
* Triangular and flying V-type UFOs - most reported between 1970 and 1990.
* Orb and polyhedron-type UFOs - most reported between 1990 and the present day.

Please note that metrics for these are *based on alleged sightings*, the bulk of which are civilian captures, and DO NOT account for hoaxes, fakes, or misrepresentations of observed objects.