-65.35% is the change from 990 to 343
Calculation steps:
[( 343 - 990 ) ÷ 990] x 100 = -65.35%
Formula
Percentage change = [(343 - 990) / 990] x 100
Subtract the new number by the original number
343 - 990 = -647
-647 ÷ 990 = -0.6535353535353535
-0.6535353535353535 x 100 = -65.35%