-84.79% is the change from 664 to 101
Calculation steps:
[( 101 - 664 ) ÷ 664] x 100 = -84.79%
Formula
Percentage change = [(101 - 664) / 664] x 100
Subtract the new number by the original number
101 - 664 = -563
-563 ÷ 664 = -0.8478915662650602
-0.8478915662650602 x 100 = -84.79%