-98.7% is the change from 690 to 9
Calculation steps:
[( 9 - 690 ) ÷ 690] x 100 = -98.7%
Formula
Percentage change = [(9 - 690) / 690] x 100
Subtract the new number by the original number
9 - 690 = -681
-681 ÷ 690 = -0.9869565217391304
-0.9869565217391304 x 100 = -98.7%