-83.3% is the change from 545 to 91
Calculation steps:
[( 91 - 545 ) ÷ 545] x 100 = -83.3%
Formula
Percentage change = [(91 - 545) / 545] x 100
Subtract the new number by the original number
91 - 545 = -454
-454 ÷ 545 = -0.8330275229357799
-0.8330275229357799 x 100 = -83.3%