-45.65% is the change from 999 to 543
Calculation steps:
[( 543 - 999 ) ÷ 999] x 100 = -45.65%
Formula
Percentage change = [(543 - 999) / 999] x 100
Subtract the new number by the original number
543 - 999 = -456
-456 ÷ 999 = -0.45645645645645644
-0.45645645645645644 x 100 = -45.65%