-92.63% is the change from 665 to 49
Calculation steps:
[( 49 - 665 ) ÷ 665] x 100 = -92.63%
Formula
Percentage change = [(49 - 665) / 665] x 100
Subtract the new number by the original number
49 - 665 = -616
-616 ÷ 665 = -0.9263157894736842
-0.9263157894736842 x 100 = -92.63%