-11.23% is the change from 187 to 166
Calculation steps:
[( 166 - 187 ) ÷ 187] x 100 = -11.23%
Formula
Percentage change = [(166 - 187) / 187] x 100
Subtract the new number by the original number
166 - 187 = -21
-21 ÷ 187 = -0.11229946524064172
-0.11229946524064172 x 100 = -11.23%