-97.14% is the change from 664 to 19
Calculation steps:
[( 19 - 664 ) ÷ 664] x 100 = -97.14%
Formula
Percentage change = [(19 - 664) / 664] x 100
Subtract the new number by the original number
19 - 664 = -645
-645 ÷ 664 = -0.9713855421686747
-0.9713855421686747 x 100 = -97.14%