-82.23% is the change from 557 to 99
Calculation steps:
[( 99 - 557 ) ÷ 557] x 100 = -82.23%
Formula
Percentage change = [(99 - 557) / 557] x 100
Subtract the new number by the original number
99 - 557 = -458
-458 ÷ 557 = -0.822262118491921
-0.822262118491921 x 100 = -82.23%