-74.14% is the change from 990 to 256
Calculation steps:
[( 256 - 990 ) ÷ 990] x 100 = -74.14%
Formula
Percentage change = [(256 - 990) / 990] x 100
Subtract the new number by the original number
256 - 990 = -734
-734 ÷ 990 = -0.7414141414141414
-0.7414141414141414 x 100 = -74.14%