-99.9% is the change from 981 to 1
Calculation steps:
[( 1 - 981 ) ÷ 981] x 100 = -99.9%
Formula
Percentage change = [(1 - 981) / 981] x 100
Subtract the new number by the original number
1 - 981 = -980
-980 ÷ 981 = -0.9989806320081549
-0.9989806320081549 x 100 = -99.9%