-30.07% is the change from 439 to 307
Calculation steps:
[( 307 - 439 ) ÷ 439] x 100 = -30.07%
Formula
Percentage change = [(307 - 439) / 439] x 100
Subtract the new number by the original number
307 - 439 = -132
-132 ÷ 439 = -0.30068337129840544
-0.30068337129840544 x 100 = -30.07%