-20.81% is the change from 173 to 137
Calculation steps:
[( 137 - 173 ) ÷ 173] x 100 = -20.81%
Formula
Percentage change = [(137 - 173) / 173] x 100
Subtract the new number by the original number
137 - 173 = -36
-36 ÷ 173 = -0.20809248554913296
-0.20809248554913296 x 100 = -20.81%