-80.29% is the change from 685 to 135
Calculation steps:
[( 135 - 685 ) ÷ 685] x 100 = -80.29%
Formula
Percentage change = [(135 - 685) / 685] x 100
Subtract the new number by the original number
135 - 685 = -550
-550 ÷ 685 = -0.8029197080291971
-0.8029197080291971 x 100 = -80.29%