-85.96% is the change from 648 to 91
Calculation steps:
[( 91 - 648 ) ÷ 648] x 100 = -85.96%
Formula
Percentage change = [(91 - 648) / 648] x 100
Subtract the new number by the original number
91 - 648 = -557
-557 ÷ 648 = -0.8595679012345679
-0.8595679012345679 x 100 = -85.96%