-74.28% is the change from 836 to 215
Calculation steps:
[( 215 - 836 ) ÷ 836] x 100 = -74.28%
Formula
Percentage change = [(215 - 836) / 836] x 100
Subtract the new number by the original number
215 - 836 = -621
-621 ÷ 836 = -0.742822966507177
-0.742822966507177 x 100 = -74.28%