Automatically returns data for past 18 months according to the selected month

Hi everyone,Is there a way to get the last 18 months' values when the user selects one particular month?For ex. if the user selects May 2015, it will return the Sales as per the following:Month ValueMay 2015 5,677Apr 2015 9,700Mar 2015 2,632........Dec 2013 678Nov 2013 2,511Thanks for the insights!Jon