-96.38% is the change from 497 to 18
Calculation steps:
[( 18 - 497 ) ÷ 497] x 100 = -96.38%
Formula
Percentage change = [(18 - 497) / 497] x 100
Subtract the new number by the original number
18 - 497 = -479
-479 ÷ 497 = -0.9637826961770624
-0.9637826961770624 x 100 = -96.38%