-15.94% is the change from 621 to 522
Calculation steps:
[( 522 - 621 ) ÷ 621] x 100 = -15.94%
Formula
Percentage change = [(522 - 621) / 621] x 100
Subtract the new number by the original number
522 - 621 = -99
-99 ÷ 621 = -0.15942028985507245
-0.15942028985507245 x 100 = -15.94%