-45.75% is the change from 306 to 166
Calculation steps:
[( 166 - 306 ) ÷ 306] x 100 = -45.75%
Formula
Percentage change = [(166 - 306) / 306] x 100
Subtract the new number by the original number
166 - 306 = -140
-140 ÷ 306 = -0.45751633986928103
-0.45751633986928103 x 100 = -45.75%