-6.15% is the change from 927 to 870
Calculation steps:
[( 870 - 927 ) ÷ 927] x 100 = -6.15%
Formula
Percentage change = [(870 - 927) / 927] x 100
Subtract the new number by the original number
870 - 927 = -57
-57 ÷ 927 = -0.061488673139158574
-0.061488673139158574 x 100 = -6.15%