You could use a secondary table calculation to get a sum of the individual results by category (effectively simulating a 'total') on the pivot table. Since you don't want the values to be repeated, you can just show them once using INDEX() and one condition:
IF INDEX() = 1
THEN WINDOW_SUM([Increase or Decrease Flag])
For your second question, you may be able to use a reference line to add just one label per bar.
Thanks Santiago. However, what I'd like to show in the table is the number of increasers separate from the number of decreasers (i.e. the table would show that in 2014 there were two increasers and 1 decreaser). I realize this wasn't very clear in my post. Do you know a way to do this?
Great, thanks so much!