-2.92% is the change from 171 to 166
Calculation steps:
[( 166 - 171 ) ÷ 171] x 100 = -2.92%
Formula
Percentage change = [(166 - 171) / 171] x 100
Subtract the new number by the original number
166 - 171 = -5
-5 ÷ 171 = -0.029239766081871343
-0.029239766081871343 x 100 = -2.92%