-51.89% is the change from 688 to 331
Calculation steps:
[( 331 - 688 ) ÷ 688] x 100 = -51.89%
Formula
Percentage change = [(331 - 688) / 688] x 100
Subtract the new number by the original number
331 - 688 = -357
-357 ÷ 688 = -0.5188953488372093
-0.5188953488372093 x 100 = -51.89%