-96.96% is the change from 691 to 21
Calculation steps:
[( 21 - 691 ) ÷ 691] x 100 = -96.96%
Formula
Percentage change = [(21 - 691) / 691] x 100
Subtract the new number by the original number
21 - 691 = -670
-670 ÷ 691 = -0.9696092619392185
-0.9696092619392185 x 100 = -96.96%