The media just love the throw around tattoo statistics (no matter how outdated), but these stats do serve a purpose of forming some idea on the breadth of tattooing's popularity.
A more artful way to convey people's love for the craft is found in this infographic by Paul Marcinkowski, which was created as a student project at Academy Of Fine Arts in Lodz. Check Paul's Behance page for close-ups of the work.
And for more statistics, check The Vanishing Tattoo, who have been compiling tattoo data in one place since 1999.
Thanks, Mikey, for the link!