-31.38% is the change from 937 to 643
Calculation steps:
[( 643 - 937 ) ÷ 937] x 100 = -31.38%
Formula
Percentage change = [(643 - 937) / 937] x 100
Subtract the new number by the original number
643 - 937 = -294
-294 ÷ 937 = -0.3137673425827108
-0.3137673425827108 x 100 = -31.38%