-99.69% is the change from 635 to 2
Calculation steps:
[( 2 - 635 ) ÷ 635] x 100 = -99.69%
Formula
Percentage change = [(2 - 635) / 635] x 100
Subtract the new number by the original number
2 - 635 = -633
-633 ÷ 635 = -0.9968503937007874
-0.9968503937007874 x 100 = -99.69%