-99.14% is the change from 810 to 7
Calculation steps:
[( 7 - 810 ) ÷ 810] x 100 = -99.14%
Formula
Percentage change = [(7 - 810) / 810] x 100
Subtract the new number by the original number
7 - 810 = -803
-803 ÷ 810 = -0.991358024691358
-0.991358024691358 x 100 = -99.14%