-80.88% is the change from 999 to 191
Calculation steps:
[( 191 - 999 ) ÷ 999] x 100 = -80.88%
Formula
Percentage change = [(191 - 999) / 999] x 100
Subtract the new number by the original number
191 - 999 = -808
-808 ÷ 999 = -0.8088088088088088
-0.8088088088088088 x 100 = -80.88%