-90.47% is the change from 661 to 63
Calculation steps:
[( 63 - 661 ) ÷ 661] x 100 = -90.47%
Formula
Percentage change = [(63 - 661) / 661] x 100
Subtract the new number by the original number
63 - 661 = -598
-598 ÷ 661 = -0.9046898638426626
-0.9046898638426626 x 100 = -90.47%