Show decreases and increases
 

I want to show price increases and price cuts of my competitors by year in a
stacked column.

For example, company A increased 5% in 2005, 6% in 2006 & took a price cut
of 4% in 2007. Is it possible to show the +5, +6, and then -4 all in one
column, with each change showing? I was thinking of just trying a
transparent autoshape over the column to show the cut, but it doesn't look
right.