-51.93% is the change from 491 to 236
Calculation steps:
[( 236 - 491 ) ÷ 491] x 100 = -51.93%
Formula
Percentage change = [(236 - 491) / 491] x 100
Subtract the new number by the original number
236 - 491 = -255
-255 ÷ 491 = -0.5193482688391039
-0.5193482688391039 x 100 = -51.93%