-97.1% is the change from 656 to 19
Calculation steps:
[( 19 - 656 ) ÷ 656] x 100 = -97.1%
Formula
Percentage change = [(19 - 656) / 656] x 100
Subtract the new number by the original number
19 - 656 = -637
-637 ÷ 656 = -0.9710365853658537
-0.9710365853658537 x 100 = -97.1%