-96.5% is the change from 543 to 19
Calculation steps:
[( 19 - 543 ) ÷ 543] x 100 = -96.5%
Formula
Percentage change = [(19 - 543) / 543] x 100
Subtract the new number by the original number
19 - 543 = -524
-524 ÷ 543 = -0.9650092081031307
-0.9650092081031307 x 100 = -96.5%