Want to analyze the data like Sales Variance Percentages from previous year to current Year.

1) Create a Calculated field to get the "2014 Sales" as the following screen shot.

2) Create a Calculated field to get the "2015 Sales" as the following screen shot.

3) Create a Calculated field to get the "2014  - 2015 Sales Variance" as the following screen shot.

4) Right click on "2014  - 2015 Sales Variance" ,  then click on "Default Properties", then click on "Number Format".

6) Then select "Percentage" as the Data format.

7) now add all the Calculated fields.