-54.94% is the change from 688 to 310
Calculation steps:
[( 310 - 688 ) ÷ 688] x 100 = -54.94%
Formula
Percentage change = [(310 - 688) / 688] x 100
Subtract the new number by the original number
310 - 688 = -378
-378 ÷ 688 = -0.5494186046511628
-0.5494186046511628 x 100 = -54.94%