-90% is the change from 690 to 69
Calculation steps:
[( 69 - 690 ) ÷ 690] x 100 = -90%
Formula
Percentage change = [(69 - 690) / 690] x 100
Subtract the new number by the original number
69 - 690 = -621
-621 ÷ 690 = -0.9
-0.9 x 100 = -90%
Example