-21.86% is the change from 668 to 522
Calculation steps:
[( 522 - 668 ) ÷ 668] x 100 = -21.86%
Formula
Percentage change = [(522 - 668) / 668] x 100
Subtract the new number by the original number
522 - 668 = -146
-146 ÷ 668 = -0.218562874251497
-0.218562874251497 x 100 = -21.86%