Showing two parallel periods

[b737]

Hi,

all of my reports showing one year comparing previous year 2014/2013 (i have that years on crosstab ), and in filter I create period , for example month in (5,6,7). Now, the problem is that I have to create report which showing parallel periods that include months from different years, like periods (may 2013 - january 2014 comparing to may 2014 - january 2015 ). How to create this to see those two periods on crosstab.

You can find attached example

Thanks