-48.71% is the change from 620 to 318
Calculation steps:
[( 318 - 620 ) ÷ 620] x 100 = -48.71%
Formula
Percentage change = [(318 - 620) / 620] x 100
Subtract the new number by the original number
318 - 620 = -302
-302 ÷ 620 = -0.4870967741935484
-0.4870967741935484 x 100 = -48.71%