-97.22% is the change from 647 to 18
Calculation steps:
[( 18 - 647 ) ÷ 647] x 100 = -97.22%
Formula
Percentage change = [(18 - 647) / 647] x 100
Subtract the new number by the original number
18 - 647 = -629
-629 ÷ 647 = -0.9721792890262752
-0.9721792890262752 x 100 = -97.22%