-33.23% is the change from 990 to 661
Calculation steps:
[( 661 - 990 ) ÷ 990] x 100 = -33.23%
Formula
Percentage change = [(661 - 990) / 990] x 100
Subtract the new number by the original number
661 - 990 = -329
-329 ÷ 990 = -0.3323232323232323
-0.3323232323232323 x 100 = -33.23%