The data set was provided by The Meteoritical Society, an organization that has been documenting meteorites since 1933. The data set we received contained the name of each meteorite, the weight, the year when it fell or was found as well as its coordinates. Very few are from before 1974. The reason for the increase after 1974 was that during this time scientists started to discover meteorites in the deserts of the Earth which eventually led to more meteorites being registered.
Since the data presented the types of meteorites, one initial thought was to show the origin of them, but unfortunately the documentation of where in space the meteorites originate from is not documented well enough to cover the large part of the approximately 34 000 meteorites that were included in the MS’s data set.