-3.44% is the change from 436 to 421
Calculation steps:
[( 421 - 436 ) ÷ 436] x 100 = -3.44%
Formula
Percentage change = [(421 - 436) / 436] x 100
Subtract the new number by the original number
421 - 436 = -15
-15 ÷ 436 = -0.034403669724770644
-0.034403669724770644 x 100 = -3.44%