Calculate percent change between values in sequential portal rows

[Bill_misc_IT]

I have an Employee Records database, with contains a related table of wage history contained within a portal, which is sorted by date.

Employee - John Doe

Date           Description           Wage         %Change

1/1/2021     Annual Raise        $20.00

1/1/2020    Original Rate        $18.00

I'm trying to create a calculation, which will display the percent difference between the data in the subject portal, and the next portal record in the sequence.  I've created the below calculation, but the results are out of sequence and/or inaccurate.  It appears that my formula is not grabbing the proper values??

 

Let ( Salary1=GetNthRecord ( Wage ; Get (  RecordNumber ) ); Let ( Salary2=GetNthRecord ( Wage ; Get ( RecordNumber ) +1 ); Case(Salary2="";0; (Salary1/Salary2)-1   )))

[comment]

I think the calculation could be simply = 

Wage / GetNthRecord ( Wage ; Get (RecordNumber) + 1 ) - 1

This needs to be unstored and formatted as percent. It will produce an error on the last portal row; the simplest solution, IMHO, is to hide the field when

Self = "?"

 

[Bill_misc_IT]

Thanks.  Both calculations works...it was the "un-stored", that was needed to get things to work, correctly.