-53.18% is the change from 173 to 81
Calculation steps:
[( 81 - 173 ) ÷ 173] x 100 = -53.18%
Formula
Percentage change = [(81 - 173) / 173] x 100
Subtract the new number by the original number
81 - 173 = -92
-92 ÷ 173 = -0.5317919075144508
-0.5317919075144508 x 100 = -53.18%