The last announcement in September 2013 was to 90%, effective from July 1, 2013. Official sources had already hinted of the hike saying that it would not be less than 10%.
The decision was finally stamped after the Consumer Price Index for Industrial Workers (CPI-IW) for December was released today.
As per the norm, the government uses this report of the last 12 months to arrive at a quantum for the purpose of any DA hike. [Read previous report]