-55.9% is the change from 991 to 437
Calculation steps:
[( 437 - 991 ) ÷ 991] x 100 = -55.9%
Formula
Percentage change = [(437 - 991) / 991] x 100
Subtract the new number by the original number
437 - 991 = -554
-554 ÷ 991 = -0.5590312815338042
-0.5590312815338042 x 100 = -55.9%