-75.03% is the change from 861 to 215
Calculation steps:
[( 215 - 861 ) ÷ 861] x 100 = -75.03%
Formula
Percentage change = [(215 - 861) / 861] x 100
Subtract the new number by the original number
215 - 861 = -646
-646 ÷ 861 = -0.7502903600464577
-0.7502903600464577 x 100 = -75.03%