Percentage column in crosstab

Hi,

We are using JasperSoft Server, to create some reports with sales details etc.

I would like create a report with an extra column, indicating the relative increase/decrease of two rows.

For example:

or this would also be good:

So far, I have everything, except for the extra percentage column, using the following fields:

Columns: Revenue (sum)
Rows: Category:name, Date (by year)

Is this possible using Jaspersoft Server?