-68.92% is the change from 666 to 207
Calculation steps:
[( 207 - 666 ) ÷ 666] x 100 = -68.92%
Formula
Percentage change = [(207 - 666) / 666] x 100
Subtract the new number by the original number
207 - 666 = -459
-459 ÷ 666 = -0.6891891891891891
-0.6891891891891891 x 100 = -68.92%