-20.63% is the change from 669 to 531
Calculation steps:
[( 531 - 669 ) ÷ 669] x 100 = -20.63%
Formula
Percentage change = [(531 - 669) / 669] x 100
Subtract the new number by the original number
531 - 669 = -138
-138 ÷ 669 = -0.2062780269058296
-0.2062780269058296 x 100 = -20.63%