-68.37% is the change from 664 to 210
Calculation steps:
[( 210 - 664 ) ÷ 664] x 100 = -68.37%
Formula
Percentage change = [(210 - 664) / 664] x 100
Subtract the new number by the original number
210 - 664 = -454
-454 ÷ 664 = -0.6837349397590361
-0.6837349397590361 x 100 = -68.37%