-67.38% is the change from 279 to 91
Calculation steps:
[( 91 - 279 ) ÷ 279] x 100 = -67.38%
Formula
Percentage change = [(91 - 279) / 279] x 100
Subtract the new number by the original number
91 - 279 = -188
-188 ÷ 279 = -0.6738351254480287
-0.6738351254480287 x 100 = -67.38%