-57.14% is the change from 91 to 39
Calculation steps:
[( 39 - 91 ) ÷ 91] x 100 = -57.14%
Formula
Percentage change = [(39 - 91) / 91] x 100
Subtract the new number by the original number
39 - 91 = -52
-52 ÷ 91 = -0.5714285714285714
-0.5714285714285714 x 100 = -57.14%