-91.04% is the change from 815 to 73
Calculation steps:
[( 73 - 815 ) ÷ 815] x 100 = -91.04%
Formula
Percentage change = [(73 - 815) / 815] x 100
Subtract the new number by the original number
73 - 815 = -742
-742 ÷ 815 = -0.9104294478527607
-0.9104294478527607 x 100 = -91.04%