-62.65% is the change from 688 to 257
Calculation steps:
[( 257 - 688 ) ÷ 688] x 100 = -62.65%
Formula
Percentage change = [(257 - 688) / 688] x 100
Subtract the new number by the original number
257 - 688 = -431
-431 ÷ 688 = -0.626453488372093
-0.626453488372093 x 100 = -62.65%