-85.98% is the change from 649 to 91
Calculation steps:
[( 91 - 649 ) ÷ 649] x 100 = -85.98%
Formula
Percentage change = [(91 - 649) / 649] x 100
Subtract the new number by the original number
91 - 649 = -558
-558 ÷ 649 = -0.8597842835130971
-0.8597842835130971 x 100 = -85.98%