-9.04% is the change from 188 to 171
Calculation steps:
[( 171 - 188 ) ÷ 188] x 100 = -9.04%
Formula
Percentage change = [(171 - 188) / 188] x 100
Subtract the new number by the original number
171 - 188 = -17
-17 ÷ 188 = -0.09042553191489362
-0.09042553191489362 x 100 = -9.04%