-89.01% is the change from 646 to 71
Calculation steps:
[( 71 - 646 ) ÷ 646] x 100 = -89.01%
Formula
Percentage change = [(71 - 646) / 646] x 100
Subtract the new number by the original number
71 - 646 = -575
-575 ÷ 646 = -0.8900928792569659
-0.8900928792569659 x 100 = -89.01%