-45.57% is the change from 305 to 166
Calculation steps:
[( 166 - 305 ) ÷ 305] x 100 = -45.57%
Formula
Percentage change = [(166 - 305) / 305] x 100
Subtract the new number by the original number
166 - 305 = -139
-139 ÷ 305 = -0.4557377049180328
-0.4557377049180328 x 100 = -45.57%