-99.23% is the change from 647 to 5
Calculation steps:
[( 5 - 647 ) ÷ 647] x 100 = -99.23%
Formula
Percentage change = [(5 - 647) / 647] x 100
Subtract the new number by the original number
5 - 647 = -642
-642 ÷ 647 = -0.9922720247295209
-0.9922720247295209 x 100 = -99.23%