-59.09% is the change from 990 to 405
Calculation steps:
[( 405 - 990 ) ÷ 990] x 100 = -59.09%
Formula
Percentage change = [(405 - 990) / 990] x 100
Subtract the new number by the original number
405 - 990 = -585
-585 ÷ 990 = -0.5909090909090909
-0.5909090909090909 x 100 = -59.09%