-96.13% is the change from 491 to 19
Calculation steps:
[( 19 - 491 ) ÷ 491] x 100 = -96.13%
Formula
Percentage change = [(19 - 491) / 491] x 100
Subtract the new number by the original number
19 - 491 = -472
-472 ÷ 491 = -0.9613034623217923
-0.9613034623217923 x 100 = -96.13%