-99.06% is the change from 635 to 6
Calculation steps:
[( 6 - 635 ) ÷ 635] x 100 = -99.06%
Formula
Percentage change = [(6 - 635) / 635] x 100
Subtract the new number by the original number
6 - 635 = -629
-629 ÷ 635 = -0.9905511811023622
-0.9905511811023622 x 100 = -99.06%