Skype's Incredible Rise, in One Image - Digits - WSJ

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"In 2013 alone, Skype carried an estimated 214 billion minutes of international “on-net” calls (from one Skype app to another, rather than calls made from Skype to a regular phone), TeleGeography said in a report released today. That’s up 36% on the previous year.
More importantly, Skype’s traffic was almost 40% the size of the entire conventional international telecom market — that is, for every ten minutes spent making international phone calls on every mobile and landline network in the entire world, four minutes are spent on Skype. The service is gradually eating its industry."

Skype's Incredible Rise, in One Image - Digits - WSJ