-93.37% is the change from 815 to 54
Calculation steps:
[( 54 - 815 ) ÷ 815] x 100 = -93.37%
Formula
Percentage change = [(54 - 815) / 815] x 100
Subtract the new number by the original number
54 - 815 = -761
-761 ÷ 815 = -0.9337423312883436
-0.9337423312883436 x 100 = -93.37%