-84.48% is the change from 999 to 155
Calculation steps:
[( 155 - 999 ) ÷ 999] x 100 = -84.48%
Formula
Percentage change = [(155 - 999) / 999] x 100
Subtract the new number by the original number
155 - 999 = -844
-844 ÷ 999 = -0.8448448448448449
-0.8448448448448449 x 100 = -84.48%