-90.06% is the change from 634 to 63
Calculation steps:
[( 63 - 634 ) ÷ 634] x 100 = -90.06%
Formula
Percentage change = [(63 - 634) / 634] x 100
Subtract the new number by the original number
63 - 634 = -571
-571 ÷ 634 = -0.9006309148264984
-0.9006309148264984 x 100 = -90.06%