-87.11% is the change from 667 to 86
Calculation steps:
[( 86 - 667 ) ÷ 667] x 100 = -87.11%
Formula
Percentage change = [(86 - 667) / 667] x 100
Subtract the new number by the original number
86 - 667 = -581
-581 ÷ 667 = -0.8710644677661169
-0.8710644677661169 x 100 = -87.11%