-68.32% is the change from 666 to 211
Calculation steps:
[( 211 - 666 ) ÷ 666] x 100 = -68.32%
Formula
Percentage change = [(211 - 666) / 666] x 100
Subtract the new number by the original number
211 - 666 = -455
-455 ÷ 666 = -0.6831831831831832
-0.6831831831831832 x 100 = -68.32%