-73.53% is the change from 835 to 221
Calculation steps:
[( 221 - 835 ) ÷ 835] x 100 = -73.53%
Formula
Percentage change = [(221 - 835) / 835] x 100
Subtract the new number by the original number
221 - 835 = -614
-614 ÷ 835 = -0.7353293413173653
-0.7353293413173653 x 100 = -73.53%