-73.08% is the change from 338 to 91
Calculation steps:
[( 91 - 338 ) ÷ 338] x 100 = -73.08%
Formula
Percentage change = [(91 - 338) / 338] x 100
Subtract the new number by the original number
91 - 338 = -247
-247 ÷ 338 = -0.7307692307692307
-0.7307692307692307 x 100 = -73.08%