-15.68% is the change from 421 to 355
Calculation steps:
[( 355 - 421 ) ÷ 421] x 100 = -15.68%
Formula
Percentage change = [(355 - 421) / 421] x 100
Subtract the new number by the original number
355 - 421 = -66
-66 ÷ 421 = -0.15676959619952494
-0.15676959619952494 x 100 = -15.68%