-1.49% is the change from 870 to 857
Calculation steps:
[( 857 - 870 ) ÷ 870] x 100 = -1.49%
Formula
Percentage change = [(857 - 870) / 870] x 100
Subtract the new number by the original number
857 - 870 = -13
-13 ÷ 870 = -0.014942528735632184
-0.014942528735632184 x 100 = -1.49%