-6.81% is the change from 191 to 178
Calculation steps:
[( 178 - 191 ) ÷ 191] x 100 = -6.81%
Formula
Percentage change = [(178 - 191) / 191] x 100
Subtract the new number by the original number
178 - 191 = -13
-13 ÷ 191 = -0.06806282722513089
-0.06806282722513089 x 100 = -6.81%