-32.24% is the change from 456 to 309
Calculation steps:
[( 309 - 456 ) ÷ 456] x 100 = -32.24%
Formula
Percentage change = [(309 - 456) / 456] x 100
Subtract the new number by the original number
309 - 456 = -147
-147 ÷ 456 = -0.3223684210526316
-0.3223684210526316 x 100 = -32.24%