-99.84% is the change from 625 to 1
Calculation steps:
[( 1 - 625 ) ÷ 625] x 100 = -99.84%
Formula
Percentage change = [(1 - 625) / 625] x 100
Subtract the new number by the original number
1 - 625 = -624
-624 ÷ 625 = -0.9984
-0.9984 x 100 = -99.84%
Example