In order to achieve the line, you are going to need to plot the bars on a continuous field. If you use the discrete year in columns that will create a pane/header that splits your line. I added a key to your data (1,2,3,4) and that is what I plotted on the column shelf.
The Product and Year are labels of the bar chart. Then a dual axis for your line. I edited the table calc in the shelf to add the ABS wrapper to show your -15% as positive (not that this is a good idea). I used the actual table calc for the label.
9.2 workbook attached.
continuous.twbx 25.9 KB