-3.49% is the change from 172 to 166
Calculation steps:
[( 166 - 172 ) ÷ 172] x 100 = -3.49%
Formula
Percentage change = [(166 - 172) / 172] x 100
Subtract the new number by the original number
166 - 172 = -6
-6 ÷ 172 = -0.03488372093023256
-0.03488372093023256 x 100 = -3.49%