-36.66% is the change from 491 to 311
Calculation steps:
[( 311 - 491 ) ÷ 491] x 100 = -36.66%
Formula
Percentage change = [(311 - 491) / 491] x 100
Subtract the new number by the original number
311 - 491 = -180
-180 ÷ 491 = -0.3665987780040733
-0.3665987780040733 x 100 = -36.66%