-30.81% is the change from 938 to 649
Calculation steps:
[( 649 - 938 ) ÷ 938] x 100 = -30.81%
Formula
Percentage change = [(649 - 938) / 938] x 100
Subtract the new number by the original number
649 - 938 = -289
-289 ÷ 938 = -0.30810234541577824
-0.30810234541577824 x 100 = -30.81%