Configuring the graphic for comparing the sales % per month

Configuring the graphic for comparing the sales % per month

I would like to have a graphic that would give me te eight of some product on the period in analises. Example:

Global sale Jan: 10.000
Global sale Fev: 10.000
Global sale Mar: 10.000

Product A sales Jan: 1.000 (10% of global sales)
Product A sales Fev: 3.000 (30% of global sales)
Product A sales Mar: 2.000 (20% of global sales)

I would like a graphic with x-axis with month and y-axis the % of product A sales and that the bar would give me 10% em January, 30% in February and 20% in March... Currently it gives me the % of the global sum of product A for that period in analysis, that means the bar in January would give around 17%, Fev 50% and Mar 33%...

Thanks in advance,
Marco