-91.35% is the change from 809 to 70
Calculation steps:
[( 70 - 809 ) ÷ 809] x 100 = -91.35%
Formula
Percentage change = [(70 - 809) / 809] x 100
Subtract the new number by the original number
70 - 809 = -739
-739 ÷ 809 = -0.9134734239802225
-0.9134734239802225 x 100 = -91.35%