-82.87% is the change from 578 to 99
Calculation steps:
[( 99 - 578 ) ÷ 578] x 100 = -82.87%
Formula
Percentage change = [(99 - 578) / 578] x 100
Subtract the new number by the original number
99 - 578 = -479
-479 ÷ 578 = -0.828719723183391
-0.828719723183391 x 100 = -82.87%