Line chart - % between years

[#1]

Hi everyone.

Here's my problem : I want to know the percentage between all the years for one data.

In my pivot table, I have no problem, but when I try to put it in a line chart, there are some issues.

I have two dimensions : all the activities and the year.  (in this order)

Year	Activity	sum(Prices)
2011	Swimming pool	1.000
2012	Swimming pool	1.100
2013	Swimming pool	1.000
2011	Dojo	2.000
2012	Dojo	2.200
2013	Dojo	2.420

So, I want that my line chart has 2 lines, the first one for the swimming pool, for which in 2012, it shows +10%" and in 2013 -"10%" and for the dojo 2012:'+10%' and 2013 "+10%".

I tried to create the following expression : sum(Prices)/above(sum(Prices))-1, but it doesn't work.

(niv_3 = activities)

But when I switch the dimensions ( Year - activity), it gave me the right numbers, except that the dimensions are inversed.

Can someone help me please ?

Thanks a lot !

[#2]

Sorry to up it, but does someone can help me ? Or maybe had I bad explained my problem ?