-97.7% is the change from 827 to 19
Calculation steps:
[( 19 - 827 ) ÷ 827] x 100 = -97.7%
Formula
Percentage change = [(19 - 827) / 827] x 100
Subtract the new number by the original number
19 - 827 = -808
-808 ÷ 827 = -0.9770253929866989
-0.9770253929866989 x 100 = -97.7%