-70% is the change from 680 to 204
Calculation steps:
[( 204 - 680 ) ÷ 680] x 100 = -70%
Formula
Percentage change = [(204 - 680) / 680] x 100
Subtract the new number by the original number
204 - 680 = -476
-476 ÷ 680 = -0.7
-0.7 x 100 = -70%
Example