-98.19% is the change from 664 to 12
Calculation steps:
[( 12 - 664 ) ÷ 664] x 100 = -98.19%
Formula
Percentage change = [(12 - 664) / 664] x 100
Subtract the new number by the original number
12 - 664 = -652
-652 ÷ 664 = -0.9819277108433735
-0.9819277108433735 x 100 = -98.19%