-97.53% is the change from 770 to 19
Calculation steps:
[( 19 - 770 ) ÷ 770] x 100 = -97.53%
Formula
Percentage change = [(19 - 770) / 770] x 100
Subtract the new number by the original number
19 - 770 = -751
-751 ÷ 770 = -0.9753246753246754
-0.9753246753246754 x 100 = -97.53%