-86.65% is the change from 644 to 86
Calculation steps:
[( 86 - 644 ) ÷ 644] x 100 = -86.65%
Formula
Percentage change = [(86 - 644) / 644] x 100
Subtract the new number by the original number
86 - 644 = -558
-558 ÷ 644 = -0.8664596273291926
-0.8664596273291926 x 100 = -86.65%