-95.64% is the change from 688 to 30
Calculation steps:
[( 30 - 688 ) ÷ 688] x 100 = -95.64%
Formula
Percentage change = [(30 - 688) / 688] x 100
Subtract the new number by the original number
30 - 688 = -658
-658 ÷ 688 = -0.9563953488372093
-0.9563953488372093 x 100 = -95.64%