-83.97% is the change from 131 to 21
Calculation steps:
[( 21 - 131 ) ÷ 131] x 100 = -83.97%
Formula
Percentage change = [(21 - 131) / 131] x 100
Subtract the new number by the original number
21 - 131 = -110
-110 ÷ 131 = -0.8396946564885496
-0.8396946564885496 x 100 = -83.97%