-89.46% is the change from 664 to 70
Calculation steps:
[( 70 - 664 ) ÷ 664] x 100 = -89.46%
Formula
Percentage change = [(70 - 664) / 664] x 100
Subtract the new number by the original number
70 - 664 = -594
-594 ÷ 664 = -0.8945783132530121
-0.8945783132530121 x 100 = -89.46%