-33.5% is the change from 609 to 405
Calculation steps:
[( 405 - 609 ) ÷ 609] x 100 = -33.5%
Formula
Percentage change = [(405 - 609) / 609] x 100
Subtract the new number by the original number
405 - 609 = -204
-204 ÷ 609 = -0.33497536945812806
-0.33497536945812806 x 100 = -33.5%