-97.7% is the change from 652 to 15
Calculation steps:
[( 15 - 652 ) ÷ 652] x 100 = -97.7%
Formula
Percentage change = [(15 - 652) / 652] x 100
Subtract the new number by the original number
15 - 652 = -637
-637 ÷ 652 = -0.9769938650306749
-0.9769938650306749 x 100 = -97.7%