-96.5% is the change from 429 to 15
Calculation steps:
[( 15 - 429 ) ÷ 429] x 100 = -96.5%
Formula
Percentage change = [(15 - 429) / 429] x 100
Subtract the new number by the original number
15 - 429 = -414
-414 ÷ 429 = -0.965034965034965
-0.965034965034965 x 100 = -96.5%