-90.43% is the change from 815 to 78
Calculation steps:
[( 78 - 815 ) ÷ 815] x 100 = -90.43%
Formula
Percentage change = [(78 - 815) / 815] x 100
Subtract the new number by the original number
78 - 815 = -737
-737 ÷ 815 = -0.9042944785276074
-0.9042944785276074 x 100 = -90.43%