-99.38% is the change from 647 to 4
Calculation steps:
[( 4 - 647 ) ÷ 647] x 100 = -99.38%
Formula
Percentage change = [(4 - 647) / 647] x 100
Subtract the new number by the original number
4 - 647 = -643
-643 ÷ 647 = -0.9938176197836167
-0.9938176197836167 x 100 = -99.38%