I may have oversimplified the problem, but maybe the attached could be a first step for you.
I created two groups:
current year data: IF DATEPART('year',[Date])=2016 THEN [Date] END
and last year's amount connected to this year's date: IF DATEPART('year',[Date])=2015 THEN DATEADD('year',1,[Date]) END
Then I plotted those two Dates as a dual axis on the column shelf.
203079ref.twbx 13.7 KB