-87.85% is the change from 543 to 66
Calculation steps:
[( 66 - 543 ) ÷ 543] x 100 = -87.85%
Formula
Percentage change = [(66 - 543) / 543] x 100
Subtract the new number by the original number
66 - 543 = -477
-477 ÷ 543 = -0.8784530386740331
-0.8784530386740331 x 100 = -87.85%