-60.9% is the change from 665 to 260
Calculation steps:
[( 260 - 665 ) ÷ 665] x 100 = -60.9%
Formula
Percentage change = [(260 - 665) / 665] x 100
Subtract the new number by the original number
260 - 665 = -405
-405 ÷ 665 = -0.6090225563909775
-0.6090225563909775 x 100 = -60.9%