-99.88% is the change from 813 to 1
Calculation steps:
[( 1 - 813 ) ÷ 813] x 100 = -99.88%
Formula
Percentage change = [(1 - 813) / 813] x 100
Subtract the new number by the original number
1 - 813 = -812
-812 ÷ 813 = -0.998769987699877
-0.998769987699877 x 100 = -99.88%