-30.92% is the change from 938 to 648
Calculation steps:
[( 648 - 938 ) ÷ 938] x 100 = -30.92%
Formula
Percentage change = [(648 - 938) / 938] x 100
Subtract the new number by the original number
648 - 938 = -290
-290 ÷ 938 = -0.3091684434968017
-0.3091684434968017 x 100 = -30.92%