-94.88% is the change from 664 to 34
Calculation steps:
[( 34 - 664 ) ÷ 664] x 100 = -94.88%
Formula
Percentage change = [(34 - 664) / 664] x 100
Subtract the new number by the original number
34 - 664 = -630
-630 ÷ 664 = -0.9487951807228916
-0.9487951807228916 x 100 = -94.88%