-33.63% is the change from 996 to 661
Calculation steps:
[( 661 - 996 ) ÷ 996] x 100 = -33.63%
Formula
Percentage change = [(661 - 996) / 996] x 100
Subtract the new number by the original number
661 - 996 = -335
-335 ÷ 996 = -0.33634538152610444
-0.33634538152610444 x 100 = -33.63%