-86.75% is the change from 687 to 91
Calculation steps:
[( 91 - 687 ) ÷ 687] x 100 = -86.75%
Formula
Percentage change = [(91 - 687) / 687] x 100
Subtract the new number by the original number
91 - 687 = -596
-596 ÷ 687 = -0.8675400291120815
-0.8675400291120815 x 100 = -86.75%