-47.12% is the change from 815 to 431
Calculation steps:
[( 431 - 815 ) ÷ 815] x 100 = -47.12%
Formula
Percentage change = [(431 - 815) / 815] x 100
Subtract the new number by the original number
431 - 815 = -384
-384 ÷ 815 = -0.47116564417177914
-0.47116564417177914 x 100 = -47.12%