-31.6% is the change from 940 to 643
Calculation steps:
[( 643 - 940 ) ÷ 940] x 100 = -31.6%
Formula
Percentage change = [(643 - 940) / 940] x 100
Subtract the new number by the original number
643 - 940 = -297
-297 ÷ 940 = -0.3159574468085106
-0.3159574468085106 x 100 = -31.6%