-53.78% is the change from 688 to 318
Calculation steps:
[( 318 - 688 ) ÷ 688] x 100 = -53.78%
Formula
Percentage change = [(318 - 688) / 688] x 100
Subtract the new number by the original number
318 - 688 = -370
-370 ÷ 688 = -0.5377906976744186
-0.5377906976744186 x 100 = -53.78%