-38.39% is the change from 310 to 191
Calculation steps:
[( 191 - 310 ) ÷ 310] x 100 = -38.39%
Formula
Percentage change = [(191 - 310) / 310] x 100
Subtract the new number by the original number
191 - 310 = -119
-119 ÷ 310 = -0.38387096774193546
-0.38387096774193546 x 100 = -38.39%