-31.57% is the change from 906 to 620
Calculation steps:
[( 620 - 906 ) ÷ 906] x 100 = -31.57%
Formula
Percentage change = [(620 - 906) / 906] x 100
Subtract the new number by the original number
620 - 906 = -286
-286 ÷ 906 = -0.31567328918322296
-0.31567328918322296 x 100 = -31.57%