-21.97% is the change from 173 to 135
Calculation steps:
[( 135 - 173 ) ÷ 173] x 100 = -21.97%
Formula
Percentage change = [(135 - 173) / 173] x 100
Subtract the new number by the original number
135 - 173 = -38
-38 ÷ 173 = -0.21965317919075145
-0.21965317919075145 x 100 = -21.97%