-2.2% is the change from 409 to 400
Calculation steps:
[( 400 - 409 ) ÷ 409] x 100 = -2.2%
Formula
Percentage change = [(400 - 409) / 409] x 100
Subtract the new number by the original number
400 - 409 = -9
-9 ÷ 409 = -0.022004889975550123
-0.022004889975550123 x 100 = -2.2%