-91.61% is the change from 870 to 73
Calculation steps:
[( 73 - 870 ) ÷ 870] x 100 = -91.61%
Formula
Percentage change = [(73 - 870) / 870] x 100
Subtract the new number by the original number
73 - 870 = -797
-797 ÷ 870 = -0.9160919540229885
-0.9160919540229885 x 100 = -91.61%