-92.76% is the change from 870 to 63
Calculation steps:
[( 63 - 870 ) ÷ 870] x 100 = -92.76%
Formula
Percentage change = [(63 - 870) / 870] x 100
Subtract the new number by the original number
63 - 870 = -807
-807 ÷ 870 = -0.9275862068965517
-0.9275862068965517 x 100 = -92.76%