-83.46% is the change from 816 to 135
Calculation steps:
[( 135 - 816 ) ÷ 816] x 100 = -83.46%
Formula
Percentage change = [(135 - 816) / 816] x 100
Subtract the new number by the original number
135 - 816 = -681
-681 ÷ 816 = -0.8345588235294118
-0.8345588235294118 x 100 = -83.46%