-30.2% is the change from 457 to 319
Calculation steps:
[( 319 - 457 ) ÷ 457] x 100 = -30.2%
Formula
Percentage change = [(319 - 457) / 457] x 100
Subtract the new number by the original number
319 - 457 = -138
-138 ÷ 457 = -0.30196936542669583
-0.30196936542669583 x 100 = -30.2%