-93.23% is the change from 591 to 40
Calculation steps:
[( 40 - 591 ) ÷ 591] x 100 = -93.23%
Formula
Percentage change = [(40 - 591) / 591] x 100
Subtract the new number by the original number
40 - 591 = -551
-551 ÷ 591 = -0.9323181049069373
-0.9323181049069373 x 100 = -93.23%