-30.78% is the change from 994 to 688
Calculation steps:
[( 688 - 994 ) ÷ 994] x 100 = -30.78%
Formula
Percentage change = [(688 - 994) / 994] x 100
Subtract the new number by the original number
688 - 994 = -306
-306 ÷ 994 = -0.30784708249496984
-0.30784708249496984 x 100 = -30.78%