-85.99% is the change from 664 to 93
Calculation steps:
[( 93 - 664 ) ÷ 664] x 100 = -85.99%
Formula
Percentage change = [(93 - 664) / 664] x 100
Subtract the new number by the original number
93 - 664 = -571
-571 ÷ 664 = -0.8599397590361446
-0.8599397590361446 x 100 = -85.99%