-11.16% is the change from 215 to 191
Calculation steps:
[( 191 - 215 ) ÷ 215] x 100 = -11.16%
Formula
Percentage change = [(191 - 215) / 215] x 100
Subtract the new number by the original number
191 - 215 = -24
-24 ÷ 215 = -0.11162790697674418
-0.11162790697674418 x 100 = -11.16%