Ukraine will raise residential gas price by 40% on 1 May 2015
Thus the overall price increase in the course of three years will equal to 101.6%.
These gas prices increases should come on top of the 50% price hike for households to occur on 1 May 2014.
Source: http://www.enerdata.net/enerdatauk/press-and-publication/energy-news-001/ 24 April 2014