-51.46% is the change from 342 to 166
Calculation steps:
[( 166 - 342 ) ÷ 342] x 100 = -51.46%
Formula
Percentage change = [(166 - 342) / 342] x 100
Subtract the new number by the original number
166 - 342 = -176
-176 ÷ 342 = -0.5146198830409356
-0.5146198830409356 x 100 = -51.46%