-80.2% is the change from 687 to 136
Calculation steps:
[( 136 - 687 ) ÷ 687] x 100 = -80.2%
Formula
Percentage change = [(136 - 687) / 687] x 100
Subtract the new number by the original number
136 - 687 = -551
-551 ÷ 687 = -0.8020378457059679
-0.8020378457059679 x 100 = -80.2%