-84.88% is the change from 602 to 91
Calculation steps:
[( 91 - 602 ) ÷ 602] x 100 = -84.88%
Formula
Percentage change = [(91 - 602) / 602] x 100
Subtract the new number by the original number
91 - 602 = -511
-511 ÷ 602 = -0.8488372093023255
-0.8488372093023255 x 100 = -84.88%