-78.05% is the change from 870 to 191
Calculation steps:
[( 191 - 870 ) ÷ 870] x 100 = -78.05%
Formula
Percentage change = [(191 - 870) / 870] x 100
Subtract the new number by the original number
191 - 870 = -679
-679 ÷ 870 = -0.7804597701149425
-0.7804597701149425 x 100 = -78.05%