-15.56% is the change from 617 to 521
Calculation steps:
[( 521 - 617 ) ÷ 617] x 100 = -15.56%
Formula
Percentage change = [(521 - 617) / 617] x 100
Subtract the new number by the original number
521 - 617 = -96
-96 ÷ 617 = -0.15559157212317667
-0.15559157212317667 x 100 = -15.56%