-80.12% is the change from 498 to 99
Calculation steps:
[( 99 - 498 ) ÷ 498] x 100 = -80.12%
Formula
Percentage change = [(99 - 498) / 498] x 100
Subtract the new number by the original number
99 - 498 = -399
-399 ÷ 498 = -0.8012048192771084
-0.8012048192771084 x 100 = -80.12%