-99.55% is the change from 670 to 3
Calculation steps:
[( 3 - 670 ) ÷ 670] x 100 = -99.55%
Formula
Percentage change = [(3 - 670) / 670] x 100
Subtract the new number by the original number
3 - 670 = -667
-667 ÷ 670 = -0.9955223880597015
-0.9955223880597015 x 100 = -99.55%