-53.55% is the change from 691 to 321
Calculation steps:
[( 321 - 691 ) ÷ 691] x 100 = -53.55%
Formula
Percentage change = [(321 - 691) / 691] x 100
Subtract the new number by the original number
321 - 691 = -370
-370 ÷ 691 = -0.5354558610709117
-0.5354558610709117 x 100 = -53.55%