Square Enix CEO Yosuke Matsuda said:I will start with the HD Games sub-segment of the Digital Entertainment segment. The greatest contributor to earnings there was ”FINAL FANTASY XV," which achieved global sales of 6 million units faster than any previous title in the franchise.
EDIT (thanks for pointing out, @SargerusBR):
Square Enix CEO Yosuke Matsuda said:This slide breaks our FY2018/3 forecasts down by segment. On the whole, downloads are accounting for an increasing percentage of sales, with more than 20% of ”FINAL FANTASY XV" sales in North America coming from downloads. We will continue to work to bolster digital sales in FY2018/3.
Source: http://www.hd.square-enix.com/eng/news/pdf/17q4outline.pdf