-30.61% is the change from 990 to 687
Calculation steps:
[( 687 - 990 ) ÷ 990] x 100 = -30.61%
Formula
Percentage change = [(687 - 990) / 990] x 100
Subtract the new number by the original number
687 - 990 = -303
-303 ÷ 990 = -0.30606060606060603
-0.30606060606060603 x 100 = -30.61%