-56.01% is the change from 957 to 421
Calculation steps:
[( 421 - 957 ) ÷ 957] x 100 = -56.01%
Formula
Percentage change = [(421 - 957) / 957] x 100
Subtract the new number by the original number
421 - 957 = -536
-536 ÷ 957 = -0.5600835945663531
-0.5600835945663531 x 100 = -56.01%