How does the attached work? Just put Year and Month in your rows, your measure on Columns and on Text, then turn on labels. Select Label Min/Max, and you should see more options appear below. You can choose to just label max, and then Pane to make sure only the max within each year is labeled. Depending on your view, you may need to use a calculation to do this, as the labeling only works in this way if things are clearly partitioned.