-95.19% is the change from 645 to 31
Calculation steps:
[( 31 - 645 ) ÷ 645] x 100 = -95.19%
Formula
Percentage change = [(31 - 645) / 645] x 100
Subtract the new number by the original number
31 - 645 = -614
-614 ÷ 645 = -0.951937984496124
-0.951937984496124 x 100 = -95.19%