-6.44% is the change from 870 to 814
Calculation steps:
[( 814 - 870 ) ÷ 870] x 100 = -6.44%
Formula
Percentage change = [(814 - 870) / 870] x 100
Subtract the new number by the original number
814 - 870 = -56
-56 ÷ 870 = -0.06436781609195402
-0.06436781609195402 x 100 = -6.44%