-83.9% is the change from 851 to 137
Calculation steps:
[( 137 - 851 ) ÷ 851] x 100 = -83.9%
Formula
Percentage change = [(137 - 851) / 851] x 100
Subtract the new number by the original number
137 - 851 = -714
-714 ÷ 851 = -0.8390129259694477
-0.8390129259694477 x 100 = -83.9%