-34.96% is the change from 981 to 638
Calculation steps:
[( 638 - 981 ) ÷ 981] x 100 = -34.96%
Formula
Percentage change = [(638 - 981) / 981] x 100
Subtract the new number by the original number
638 - 981 = -343
-343 ÷ 981 = -0.34964322120285424
-0.34964322120285424 x 100 = -34.96%