-51.03% is the change from 339 to 166
Calculation steps:
[( 166 - 339 ) ÷ 339] x 100 = -51.03%
Formula
Percentage change = [(166 - 339) / 339] x 100
Subtract the new number by the original number
166 - 339 = -173
-173 ÷ 339 = -0.5103244837758112
-0.5103244837758112 x 100 = -51.03%