-99.55% is the change from 660 to 3
Calculation steps:
[( 3 - 660 ) ÷ 660] x 100 = -99.55%
Formula
Percentage change = [(3 - 660) / 660] x 100
Subtract the new number by the original number
3 - 660 = -657
-657 ÷ 660 = -0.9954545454545455
-0.9954545454545455 x 100 = -99.55%