-70.34% is the change from 870 to 258
Calculation steps:
[( 258 - 870 ) ÷ 870] x 100 = -70.34%
Formula
Percentage change = [(258 - 870) / 870] x 100
Subtract the new number by the original number
258 - 870 = -612
-612 ÷ 870 = -0.7034482758620689
-0.7034482758620689 x 100 = -70.34%