-95.66% is the change from 668 to 29
Calculation steps:
[( 29 - 668 ) ÷ 668] x 100 = -95.66%
Formula
Percentage change = [(29 - 668) / 668] x 100
Subtract the new number by the original number
29 - 668 = -639
-639 ÷ 668 = -0.9565868263473054
-0.9565868263473054 x 100 = -95.66%