-83.97% is the change from 992 to 159
Calculation steps:
[( 159 - 992 ) ÷ 992] x 100 = -83.97%
Formula
Percentage change = [(159 - 992) / 992] x 100
Subtract the new number by the original number
159 - 992 = -833
-833 ÷ 992 = -0.8397177419354839
-0.8397177419354839 x 100 = -83.97%