-83% is the change from 812 to 138
Calculation steps:
[( 138 - 812 ) ÷ 812] x 100 = -83%
Formula
Percentage change = [(138 - 812) / 812] x 100
Subtract the new number by the original number
138 - 812 = -674
-674 ÷ 812 = -0.8300492610837439
-0.8300492610837439 x 100 = -83%