How Do I: The rank is a value from 1-12 with 1 being awarded to the month with the greatest Average Gift Value and 12 being awarded to the month with the smallest Average Gift Value’ (using SSRS REPORT)

Hi All,

How can I get the value so below image and my requirement (using SSRS REPORT)

The rank is a value from 1-12 with 1 being awarded to the month with the greatest ‘Average Gift Value’ and 12 being awarded to the month with the smallest ‘Average Gift Value’