-36.19% is the change from 641 to 409
Calculation steps:
[( 409 - 641 ) ÷ 641] x 100 = -36.19%
Formula
Percentage change = [(409 - 641) / 641] x 100
Subtract the new number by the original number
409 - 641 = -232
-232 ÷ 641 = -0.3619344773790952
-0.3619344773790952 x 100 = -36.19%