-50.3% is the change from 334 to 166
Calculation steps:
[( 166 - 334 ) ÷ 334] x 100 = -50.3%
Formula
Percentage change = [(166 - 334) / 334] x 100
Subtract the new number by the original number
166 - 334 = -168
-168 ÷ 334 = -0.5029940119760479
-0.5029940119760479 x 100 = -50.3%