-2.85% is the change from 421 to 409
Calculation steps:
[( 409 - 421 ) ÷ 421] x 100 = -2.85%
Formula
Percentage change = [(409 - 421) / 421] x 100
Subtract the new number by the original number
409 - 421 = -12
-12 ÷ 421 = -0.028503562945368172
-0.028503562945368172 x 100 = -2.85%