-66.55% is the change from 870 to 291
Calculation steps:
[( 291 - 870 ) ÷ 870] x 100 = -66.55%
Formula
Percentage change = [(291 - 870) / 870] x 100
Subtract the new number by the original number
291 - 870 = -579
-579 ÷ 870 = -0.6655172413793103
-0.6655172413793103 x 100 = -66.55%