-83.39% is the change from 813 to 135
Calculation steps:
[( 135 - 813 ) ÷ 813] x 100 = -83.39%
Formula
Percentage change = [(135 - 813) / 813] x 100
Subtract the new number by the original number
135 - 813 = -678
-678 ÷ 813 = -0.8339483394833949
-0.8339483394833949 x 100 = -83.39%