-96.45% is the change from 423 to 15
Calculation steps:
[( 15 - 423 ) ÷ 423] x 100 = -96.45%
Formula
Percentage change = [(15 - 423) / 423] x 100
Subtract the new number by the original number
15 - 423 = -408
-408 ÷ 423 = -0.9645390070921985
-0.9645390070921985 x 100 = -96.45%