-47.8% is the change from 318 to 166
Calculation steps:
[( 166 - 318 ) ÷ 318] x 100 = -47.8%
Formula
Percentage change = [(166 - 318) / 318] x 100
Subtract the new number by the original number
166 - 318 = -152
-152 ÷ 318 = -0.4779874213836478
-0.4779874213836478 x 100 = -47.8%