In his post at https://www.tableau.com/about/blog/2016/5/information-demand-54621, my Slalom colleague John Mathis uses an interesting custom number formatting trick that shows arrows indicating an increase/decrease over prior year.
This post explains how to do that.
Open the Windows application Character Map by either 1) typing [Windows] + R then “charmap” or 2) typing [Windows] + S, search for “character map”, click on Character Map.
Select the “Segoe UI Symbol” font.
In the “Search for:” box at bottom, type “triangle” and click the Search button.
Double-click on the “Black Up-Pointing Triangle” and “Black Down-Pointing Triangle” symbols to add them to the “Characters to copy:” box.
The two symbols are automatically copied to the Windows clipboard, but you can click the Copy button to make sure.
Go to Tableau Desktop and paste the two arrows into the field’s default number format.
Add more text to the custom format as needed.
You are done!