-83.73% is the change from 977 to 159
Calculation steps:
[( 159 - 977 ) ÷ 977] x 100 = -83.73%
Formula
Percentage change = [(159 - 977) / 977] x 100
Subtract the new number by the original number
159 - 977 = -818
-818 ÷ 977 = -0.8372569089048106
-0.8372569089048106 x 100 = -83.73%