-99.75% is the change from 810 to 2
Calculation steps:
[( 2 - 810 ) ÷ 810] x 100 = -99.75%
Formula
Percentage change = [(2 - 810) / 810] x 100
Subtract the new number by the original number
2 - 810 = -808
-808 ÷ 810 = -0.9975308641975309
-0.9975308641975309 x 100 = -99.75%