-51.82% is the change from 687 to 331
Calculation steps:
[( 331 - 687 ) ÷ 687] x 100 = -51.82%
Formula
Percentage change = [(331 - 687) / 687] x 100
Subtract the new number by the original number
331 - 687 = -356
-356 ÷ 687 = -0.5181950509461426
-0.5181950509461426 x 100 = -51.82%