The regulation specifies that the investment return data be provided for the 1, 5, and 10 year "calendar year periods (or for the life of the alternative, if shorter) ending on the date of the most recently completed calendar year". DOL Reg. Section 2550.404a-5(d)(1)(ii). However, FAB 2012-2R provides that more recent return data may be provided in Q&A-23 and allows returns to be as of "the most recently completed calendar month or quarter." Hope this helps.