-50.94% is the change from 691 to 339
Calculation steps:
[( 339 - 691 ) ÷ 691] x 100 = -50.94%
Formula
Percentage change = [(339 - 691) / 691] x 100
Subtract the new number by the original number
339 - 691 = -352
-352 ÷ 691 = -0.5094066570188133
-0.5094066570188133 x 100 = -50.94%