-80.17% is the change from 686 to 136
Calculation steps:
[( 136 - 686 ) ÷ 686] x 100 = -80.17%
Formula
Percentage change = [(136 - 686) / 686] x 100
Subtract the new number by the original number
136 - 686 = -550
-550 ÷ 686 = -0.8017492711370262
-0.8017492711370262 x 100 = -80.17%