I want to show the relative portion of each wares year after year. Visually I am thinking of showing one staked bar per year, each portion of the bar representing the sales (value or %) of a ware.
Example:
ware1 *
ware2 =
ware3 +
* *
* * * *
* * = =
= = + =
+ = + =
+ + + +
Y1 Y2 Y3 Y4
How to do it?