-97.88% is the change from 660 to 14
Calculation steps:
[( 14 - 660 ) ÷ 660] x 100 = -97.88%
Formula
Percentage change = [(14 - 660) / 660] x 100
Subtract the new number by the original number
14 - 660 = -646
-646 ÷ 660 = -0.9787878787878788
-0.9787878787878788 x 100 = -97.88%