-70.71% is the change from 990 to 290
Calculation steps:
[( 290 - 990 ) ÷ 990] x 100 = -70.71%
Formula
Percentage change = [(290 - 990) / 990] x 100
Subtract the new number by the original number
290 - 990 = -700
-700 ÷ 990 = -0.7070707070707071
-0.7070707070707071 x 100 = -70.71%