-33.04% is the change from 457 to 306
Calculation steps:
[( 306 - 457 ) ÷ 457] x 100 = -33.04%
Formula
Percentage change = [(306 - 457) / 457] x 100
Subtract the new number by the original number
306 - 457 = -151
-151 ÷ 457 = -0.3304157549234136
-0.3304157549234136 x 100 = -33.04%