-98.95% is the change from 664 to 7
Calculation steps:
[( 7 - 664 ) ÷ 664] x 100 = -98.95%
Formula
Percentage change = [(7 - 664) / 664] x 100
Subtract the new number by the original number
7 - 664 = -657
-657 ÷ 664 = -0.9894578313253012
-0.9894578313253012 x 100 = -98.95%