-23.12% is the change from 666 to 512
Calculation steps:
[( 512 - 666 ) ÷ 666] x 100 = -23.12%
Formula
Percentage change = [(512 - 666) / 666] x 100
Subtract the new number by the original number
512 - 666 = -154
-154 ÷ 666 = -0.23123123123123124
-0.23123123123123124 x 100 = -23.12%