-78.06% is the change from 620 to 136
Calculation steps:
[( 136 - 620 ) ÷ 620] x 100 = -78.06%
Formula
Percentage change = [(136 - 620) / 620] x 100
Subtract the new number by the original number
136 - 620 = -484
-484 ÷ 620 = -0.7806451612903226
-0.7806451612903226 x 100 = -78.06%