-83.51% is the change from 831 to 137
Calculation steps:
[( 137 - 831 ) ÷ 831] x 100 = -83.51%
Formula
Percentage change = [(137 - 831) / 831] x 100
Subtract the new number by the original number
137 - 831 = -694
-694 ÷ 831 = -0.8351383874849578
-0.8351383874849578 x 100 = -83.51%