While I agree to some of the points made in the post, I don't think the author provided a better alternative. Stacked bars are not any better for looking at how the percentage change on the green one.

http://i.imgur.com/jfuJGu5.gif

Here is my solution:

* It retains the line aspect of it, which is essential as we are talking about a trend here.

* It easily allows you to see it both in stacked and overlapped lines. Each one of them is good at communicating clearly a certain point about the data.

* It also mitigates the problem in nostromo's comment, where a whole bunch of lines could overlap without a clear view on a single point of interest.