-97.04% is the change from 641 to 19
Calculation steps:
[( 19 - 641 ) ÷ 641] x 100 = -97.04%
Formula
Percentage change = [(19 - 641) / 641] x 100
Subtract the new number by the original number
19 - 641 = -622
-622 ÷ 641 = -0.9703588143525741
-0.9703588143525741 x 100 = -97.04%