-99.53% is the change from 644 to 3
Calculation steps:
[( 3 - 644 ) ÷ 644] x 100 = -99.53%
Formula
Percentage change = [(3 - 644) / 644] x 100
Subtract the new number by the original number
3 - 644 = -641
-641 ÷ 644 = -0.9953416149068323
-0.9953416149068323 x 100 = -99.53%