-39.56% is the change from 91 to 55
Calculation steps:
[( 55 - 91 ) ÷ 91] x 100 = -39.56%
Formula
Percentage change = [(55 - 91) / 91] x 100
Subtract the new number by the original number
55 - 91 = -36
-36 ÷ 91 = -0.3956043956043956
-0.3956043956043956 x 100 = -39.56%