-91.96% is the change from 423 to 34
Calculation steps:
[( 34 - 423 ) ÷ 423] x 100 = -91.96%
Formula
Percentage change = [(34 - 423) / 423] x 100
Subtract the new number by the original number
34 - 423 = -389
-389 ÷ 423 = -0.9196217494089834
-0.9196217494089834 x 100 = -91.96%