-83.24% is the change from 543 to 91
Calculation steps:
[( 91 - 543 ) ÷ 543] x 100 = -83.24%
Formula
Percentage change = [(91 - 543) / 543] x 100
Subtract the new number by the original number
91 - 543 = -452
-452 ÷ 543 = -0.8324125230202578
-0.8324125230202578 x 100 = -83.24%