-98.52% is the change from 811 to 12
Calculation steps:
[( 12 - 811 ) ÷ 811] x 100 = -98.52%
Formula
Percentage change = [(12 - 811) / 811] x 100
Subtract the new number by the original number
12 - 811 = -799
-799 ÷ 811 = -0.9852034525277436
-0.9852034525277436 x 100 = -98.52%