-83.99% is the change from 993 to 159
Calculation steps:
[( 159 - 993 ) ÷ 993] x 100 = -83.99%
Formula
Percentage change = [(159 - 993) / 993] x 100
Subtract the new number by the original number
159 - 993 = -834
-834 ÷ 993 = -0.8398791540785498
-0.8398791540785498 x 100 = -83.99%