-74.22% is the change from 834 to 215
Calculation steps:
[( 215 - 834 ) ÷ 834] x 100 = -74.22%
Formula
Percentage change = [(215 - 834) / 834] x 100
Subtract the new number by the original number
215 - 834 = -619
-619 ÷ 834 = -0.7422062350119905
-0.7422062350119905 x 100 = -74.22%