-31.03% is the change from 609 to 420
Calculation steps:
[( 420 - 609 ) ÷ 609] x 100 = -31.03%
Formula
Percentage change = [(420 - 609) / 609] x 100
Subtract the new number by the original number
420 - 609 = -189
-189 ÷ 609 = -0.3103448275862069
-0.3103448275862069 x 100 = -31.03%