-98.52% is the change from 810 to 12
Calculation steps:
[( 12 - 810 ) ÷ 810] x 100 = -98.52%
Formula
Percentage change = [(12 - 810) / 810] x 100
Subtract the new number by the original number
12 - 810 = -798
-798 ÷ 810 = -0.9851851851851852
-0.9851851851851852 x 100 = -98.52%