-72.95% is the change from 817 to 221
Calculation steps:
[( 221 - 817 ) ÷ 817] x 100 = -72.95%
Formula
Percentage change = [(221 - 817) / 817] x 100
Subtract the new number by the original number
221 - 817 = -596
-596 ÷ 817 = -0.7294981640146879
-0.7294981640146879 x 100 = -72.95%