-15.71% is the change from 191 to 161
Calculation steps:
[( 161 - 191 ) ÷ 191] x 100 = -15.71%
Formula
Percentage change = [(161 - 191) / 191] x 100
Subtract the new number by the original number
161 - 191 = -30
-30 ÷ 191 = -0.15706806282722513
-0.15706806282722513 x 100 = -15.71%