-4.04% is the change from 421 to 404
Calculation steps:
[( 404 - 421 ) ÷ 421] x 100 = -4.04%
Formula
Percentage change = [(404 - 421) / 421] x 100
Subtract the new number by the original number
404 - 421 = -17
-17 ÷ 421 = -0.040380047505938245
-0.040380047505938245 x 100 = -4.04%