That was an increase of about 69% over 2011. For 2013 however, the pedal is to the metal and ABI Research figures the data usage is going to explode.
Global data traffic will see a growth rate of 207% in 2013 thanks to 4G LTE network rollouts. The faster speeds that LTE provide fosters more app downloading, content streaming and overall data usage, so the amount of data will increase exponentially. This is sure to create an upward trend for a while since some major markets have only begun to rollout LTE service, like India and China.
sources : ABI Research via BGR