-98.1% is the change from 685 to 13
Calculation steps:
[( 13 - 685 ) ÷ 685] x 100 = -98.1%
Formula
Percentage change = [(13 - 685) / 685] x 100
Subtract the new number by the original number
13 - 685 = -672
-672 ÷ 685 = -0.981021897810219
-0.981021897810219 x 100 = -98.1%