-34.45% is the change from 981 to 643
Calculation steps:
[( 643 - 981 ) ÷ 981] x 100 = -34.45%
Formula
Percentage change = [(643 - 981) / 981] x 100
Subtract the new number by the original number
643 - 981 = -338
-338 ÷ 981 = -0.34454638124362896
-0.34454638124362896 x 100 = -34.45%