-95.72% is the change from 421 to 18
Calculation steps:
[( 18 - 421 ) ÷ 421] x 100 = -95.72%
Formula
Percentage change = [(18 - 421) / 421] x 100
Subtract the new number by the original number
18 - 421 = -403
-403 ÷ 421 = -0.9572446555819477
-0.9572446555819477 x 100 = -95.72%