-24.17% is the change from 666 to 505
Calculation steps:
[( 505 - 666 ) ÷ 666] x 100 = -24.17%
Formula
Percentage change = [(505 - 666) / 666] x 100
Subtract the new number by the original number
505 - 666 = -161
-161 ÷ 666 = -0.24174174174174173
-0.24174174174174173 x 100 = -24.17%