-98.88% is the change from 623 to 7
Calculation steps:
[( 7 - 623 ) ÷ 623] x 100 = -98.88%
Formula
Percentage change = [(7 - 623) / 623] x 100
Subtract the new number by the original number
7 - 623 = -616
-616 ÷ 623 = -0.9887640449438202
-0.9887640449438202 x 100 = -98.88%