-69.46% is the change from 668 to 204
Calculation steps:
[( 204 - 668 ) ÷ 668] x 100 = -69.46%
Formula
Percentage change = [(204 - 668) / 668] x 100
Subtract the new number by the original number
204 - 668 = -464
-464 ÷ 668 = -0.6946107784431138
-0.6946107784431138 x 100 = -69.46%