Also, from my research, I found the National UFO Reporting Society (http://www.nuforc.org/) which lists every UFO report, dating back to the early 1900's (even the odd sighting earlier on). Rather than listing this data as research, I wanted to clearly show a comparison between the years, as you can see below. However, they documented the sightings per month therefore I focused on the last 10 years primarily.
From this same website, I found UFO sightings categorised by shape or appearance. However, this was also listed per month therefore I decided to focus one particular month in particular. The highest amount of UFO sightings was in July 2010 therefore I used this as the basis of my data representation.
I categorised them into the following: Circle, triangle, fireball, oval, light, sphere and unknown. However, there were a few other shapes but due to the low amount of similar sightings, I decided to exclude these.
However, I then found every single UFO report they have received categorised by these shapes so I decided to represent these through pictograms also.
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