Software Developer
I can assure you that list is US centric. There are plenty of reported sightings in all of Europe in the last 30 years.
The 90s especially and there are several 'mass sightings' that I've read about in Portugal that are simply not in that list.
There is a clear lack of centralized information about all the world ufo reports, even if their explanation is prozaic.
People always seem to forget about the more realistic zoo hypothesis.
Something that even humanity would do if we made contact with a less developed species/civilization.