-67.88% is the change from 990 to 318
Calculation steps:
[( 318 - 990 ) ÷ 990] x 100 = -67.88%
Formula
Percentage change = [(318 - 990) / 990] x 100
Subtract the new number by the original number
318 - 990 = -672
-672 ÷ 990 = -0.6787878787878788
-0.6787878787878788 x 100 = -67.88%