-51.74% is the change from 172 to 83
Calculation steps:
[( 83 - 172 ) ÷ 172] x 100 = -51.74%
Formula
Percentage change = [(83 - 172) / 172] x 100
Subtract the new number by the original number
83 - 172 = -89
-89 ÷ 172 = -0.5174418604651163
-0.5174418604651163 x 100 = -51.74%