-87.86% is the change from 667 to 81
Calculation steps:
[( 81 - 667 ) ÷ 667] x 100 = -87.86%
Formula
Percentage change = [(81 - 667) / 667] x 100
Subtract the new number by the original number
81 - 667 = -586
-586 ÷ 667 = -0.8785607196401799
-0.8785607196401799 x 100 = -87.86%