I think they just have a very good system, with cameras monitoring their skies and several accounts (youtube, twitter, etc). Meteroides.net is always filming and reporting trajectories of bolides and the like in their skies. They're very well organized, with people sending them their films. It creates a bias of fireballs over Spain. Before used to be Puerto Rico, but during the last years, they either closed shop or their system is not as good as it used to.
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