-86.25% is the change from 662 to 91
Calculation steps:
[( 91 - 662 ) ÷ 662] x 100 = -86.25%
Formula
Percentage change = [(91 - 662) / 662] x 100
Subtract the new number by the original number
91 - 662 = -571
-571 ÷ 662 = -0.8625377643504532
-0.8625377643504532 x 100 = -86.25%