-37.37% is the change from 990 to 620
Calculation steps:
[( 620 - 990 ) ÷ 990] x 100 = -37.37%
Formula
Percentage change = [(620 - 990) / 990] x 100
Subtract the new number by the original number
620 - 990 = -370
-370 ÷ 990 = -0.37373737373737376
-0.37373737373737376 x 100 = -37.37%