-91.77% is the change from 668 to 55
Calculation steps:
[( 55 - 668 ) ÷ 668] x 100 = -91.77%
Formula
Percentage change = [(55 - 668) / 668] x 100
Subtract the new number by the original number
55 - 668 = -613
-613 ÷ 668 = -0.9176646706586826
-0.9176646706586826 x 100 = -91.77%