-31.74% is the change from 942 to 643
Calculation steps:
[( 643 - 942 ) ÷ 942] x 100 = -31.74%
Formula
Percentage change = [(643 - 942) / 942] x 100
Subtract the new number by the original number
643 - 942 = -299
-299 ÷ 942 = -0.3174097664543524
-0.3174097664543524 x 100 = -31.74%