-90.16% is the change from 620 to 61
Calculation steps:
[( 61 - 620 ) ÷ 620] x 100 = -90.16%
Formula
Percentage change = [(61 - 620) / 620] x 100
Subtract the new number by the original number
61 - 620 = -559
-559 ÷ 620 = -0.9016129032258065
-0.9016129032258065 x 100 = -90.16%