-33.8% is the change from 938 to 621
Calculation steps:
[( 621 - 938 ) ÷ 938] x 100 = -33.8%
Formula
Percentage change = [(621 - 938) / 938] x 100
Subtract the new number by the original number
621 - 938 = -317
-317 ÷ 938 = -0.337953091684435
-0.337953091684435 x 100 = -33.8%