-98.34% is the change from 663 to 11
Calculation steps:
[( 11 - 663 ) ÷ 663] x 100 = -98.34%
Formula
Percentage change = [(11 - 663) / 663] x 100
Subtract the new number by the original number
11 - 663 = -652
-652 ÷ 663 = -0.9834087481146304
-0.9834087481146304 x 100 = -98.34%