-2.33% is the change from 172 to 168
Calculation steps:
[( 168 - 172 ) ÷ 172] x 100 = -2.33%
Formula
Percentage change = [(168 - 172) / 172] x 100
Subtract the new number by the original number
168 - 172 = -4
-4 ÷ 172 = -0.023255813953488372
-0.023255813953488372 x 100 = -2.33%