-98.98% is the change from 688 to 7
Calculation steps:
[( 7 - 688 ) ÷ 688] x 100 = -98.98%
Formula
Percentage change = [(7 - 688) / 688] x 100
Subtract the new number by the original number
7 - 688 = -681
-681 ÷ 688 = -0.9898255813953488
-0.9898255813953488 x 100 = -98.98%