-30.88% is the change from 897 to 620
Calculation steps:
[( 620 - 897 ) ÷ 897] x 100 = -30.88%
Formula
Percentage change = [(620 - 897) / 897] x 100
Subtract the new number by the original number
620 - 897 = -277
-277 ÷ 897 = -0.3088071348940914
-0.3088071348940914 x 100 = -30.88%