-97.56% is the change from 491 to 12
Calculation steps:
[( 12 - 491 ) ÷ 491] x 100 = -97.56%
Formula
Percentage change = [(12 - 491) / 491] x 100
Subtract the new number by the original number
12 - 491 = -479
-479 ÷ 491 = -0.9755600814663951
-0.9755600814663951 x 100 = -97.56%