So few sightings are actually reported, there are no reliable statistics.
I could find only one reported sighting, O'Hare International in Chicago, IL, in 2006-7. Point of interest:Xiashoan, China had one reported sighting.
Until the later part of the 20th century most reported sightings were from the US. After that until present the US has the most followed by Mexico, Great Britian, India, Russia. There are many sightings over military bases and places of military conflict.
These flying disc known as UFOs are in all kind of shapes and sizes. According to UFO Hunters there was once a UFO reported to be a mile wide, longer than a football field. Some maybe smaller than a airplane.
Seven sightings of UFO's in the US, Canada and France.
There are those among us who believe that UFOs have always been hovering nearby.
No records indicate that UFOs will "save us" in 2012. 2012 hasn't occurred yet, so it is unknown if they will.
Approximately 47,511 suicides were reported in the US in 2019.
UFOs are very often seen on Earth, and nobody knows what is inside of one. If there are truly UFOs from space, when they supposedly come to Earth they may already be learning from us.
UFOs are controlled by those who haven't been able to identify a flying object. The rest of us that can identify them know what they are and who they belong to.
no-one knows...
A large portion of UFO sightings occure in the US every year.
I don't know about all governments but the US government claims to have no knowledge of UFOs or alien beings. But UFOlogists (people that study UFOs) have classified 4 distinctly different types of aliens.