-85.79% is the change from 971 to 138
Calculation steps:
[( 138 - 971 ) ÷ 971] x 100 = -85.79%
Formula
Percentage change = [(138 - 971) / 971] x 100
Subtract the new number by the original number
138 - 971 = -833
-833 ÷ 971 = -0.8578784757981462
-0.8578784757981462 x 100 = -85.79%