-98.52% is the change from 813 to 12
Calculation steps:
[( 12 - 813 ) ÷ 813] x 100 = -98.52%
Formula
Percentage change = [(12 - 813) / 813] x 100
Subtract the new number by the original number
12 - 813 = -801
-801 ÷ 813 = -0.985239852398524
-0.985239852398524 x 100 = -98.52%