-86.63% is the change from 643 to 86
Calculation steps:
[( 86 - 643 ) ÷ 643] x 100 = -86.63%
Formula
Percentage change = [(86 - 643) / 643] x 100
Subtract the new number by the original number
86 - 643 = -557
-557 ÷ 643 = -0.8662519440124417
-0.8662519440124417 x 100 = -86.63%