-10.75% is the change from 186 to 166
Calculation steps:
[( 166 - 186 ) ÷ 186] x 100 = -10.75%
Formula
Percentage change = [(166 - 186) / 186] x 100
Subtract the new number by the original number
166 - 186 = -20
-20 ÷ 186 = -0.10752688172043011
-0.10752688172043011 x 100 = -10.75%