-38.59% is the change from 666 to 409
Calculation steps:
[( 409 - 666 ) ÷ 666] x 100 = -38.59%
Formula
Percentage change = [(409 - 666) / 666] x 100
Subtract the new number by the original number
409 - 666 = -257
-257 ÷ 666 = -0.3858858858858859
-0.3858858858858859 x 100 = -38.59%