-39.07% is the change from 691 to 421
Calculation steps:
[( 421 - 691 ) ÷ 691] x 100 = -39.07%
Formula
Percentage change = [(421 - 691) / 691] x 100
Subtract the new number by the original number
421 - 691 = -270
-270 ÷ 691 = -0.3907380607814761
-0.3907380607814761 x 100 = -39.07%