-34.32% is the change from 609 to 400
Calculation steps:
[( 400 - 609 ) ÷ 609] x 100 = -34.32%
Formula
Percentage change = [(400 - 609) / 609] x 100
Subtract the new number by the original number
400 - 609 = -209
-209 ÷ 609 = -0.34318555008210183
-0.34318555008210183 x 100 = -34.32%