-96.15% is the change from 545 to 21
Calculation steps:
[( 21 - 545 ) ÷ 545] x 100 = -96.15%
Formula
Percentage change = [(21 - 545) / 545] x 100
Subtract the new number by the original number
21 - 545 = -524
-524 ÷ 545 = -0.9614678899082569
-0.9614678899082569 x 100 = -96.15%