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This is a bit trickier than it looks because I assume you want this indicator to be displayed along with your other dimensions on the left. Here is a starting point - try creating the calculated field [CY2016]:
IF [Year] = 2016 THEN 1 ELSE 0 END
Then use SUM([CY2016]) in a FIXED LOD expression (this might require Tableau 10) with the appropriate dimensions. That should get you 1s if there were sales in 2016, 0s otherwise.