-98.14% is the change from 645 to 12
Calculation steps:
[( 12 - 645 ) ÷ 645] x 100 = -98.14%
Formula
Percentage change = [(12 - 645) / 645] x 100
Subtract the new number by the original number
12 - 645 = -633
-633 ÷ 645 = -0.9813953488372092
-0.9813953488372092 x 100 = -98.14%