-68.1% is the change from 815 to 260
Calculation steps:
[( 260 - 815 ) ÷ 815] x 100 = -68.1%
Formula
Percentage change = [(260 - 815) / 815] x 100
Subtract the new number by the original number
260 - 815 = -555
-555 ÷ 815 = -0.6809815950920245
-0.6809815950920245 x 100 = -68.1%