-97.13% is the change from 663 to 19
Calculation steps:
[( 19 - 663 ) ÷ 663] x 100 = -97.13%
Formula
Percentage change = [(19 - 663) / 663] x 100
Subtract the new number by the original number
19 - 663 = -644
-644 ÷ 663 = -0.971342383107089
-0.971342383107089 x 100 = -97.13%